Penny Lancaster, 53, wows in a tiny black bikini as she soaks up the sun with husband Rod Stewart, 79, on £50million yacht in Sardinia

Penny Lancaster dressed for the European heatwave as she set sail with husband Rob Stewart and their family in Sardinia.

The couple are enjoying a family break on a £50million yacht and as temperatures across the region hit the high 30s, Penny stripped down to a barely there black bikini.

The model, 53, looked incredible in the tiny halterneck bikini as she sunbathed on deck and chatted with her family.

Rod, 79, meanwhile tried to keep cool by draping a T-shirt over his head as he relaxed in a lemon yellow shirt and bold shorts.

Penny later swapped her bikini for a green and pink floral print cover-up as the family jumped on a dinghy to head to shore. 

Penny Lancaster , 53, dressed for the European heatwave as she set sail with husband Rob Stewart, 79, and their family in Sardinia

Penny Lancaster , 53, dressed for the European heatwave as she set sail with husband Rob Stewart, 79, and their family in Sardinia

The rocker is enjoying the trip with six of his eight children, as well as his baby grandson Otis and several of his kids' partners

The rocker is enjoying the trip with six of his eight children, as well as his baby grandson Otis and several of his kids' partners 

The Sailing singer has whisked most of his family away on the lavish holiday to Porto Cervo in Sardinia. 

The rocker is enjoying the trip with six of his eight children, as well as his baby grandson Otis and several of his kids' partners.

The blended family took to their Instagrams this week to share a slew of sweet snaps from the getaway.

One heartwarming shot showed Penny and Rod playing with one-year-old Otis on the boat, as the little boy burst into giggles.

The couple - who married in 2007 - were joined by their two sons Alastair Wallace, 18, and Aiden Patrick, 13, as well as Alastair's girlfriend Eloise Darlington, 18.

Joining them were Kimberly, 44, and Sean, 43, — Rod's two children from his marriage to actress Alana Stewart.

While his daughter from his relationship with model Kelly Emberg and Otis' mother Ruby, 36, was there with her fiancé Jake Kalic.

Penny laughed as she moved spots to a lounger next to pals

Penny laughed as she moved spots to a lounger next to pals 

Rod meanwhile tried to keep cool by draping a t-shirt over his head as he relaxed in a lemon yellow shirt and bold shorts

Rod meanwhile tried to keep cool by draping a t-shirt over his head as he relaxed in a lemon yellow shirt and bold shorts

She looked great in the swimwear

She looked great in the swimwear

And his daughter Renee, 32, from his marriage to actress Rachel Hunter was joined by her boyfriend Adam Sumner.

However, his other child with Rachel, son Liam, 29, was not seen in any photos, nor was his eldest child Sarah Streeter, 60, who he put up for adoption as a baby.

The Stewart clan could be seen enjoying several beers in the sun and going out for opulent dinners together.

The trip comes after Rod and Penny recently discussed the secrets to their loving and successful marriage and how they navigated the unique problems of living in a 'blended family.'

Reflecting on their home life in a candid interview last week, the duo detailed how they ensure their relationship stays 'special' and bring up their brood to remain humble.

Speaking to HELLO!, Rod explained: 'We listen to each other and try to resolve all our disagreements - the dirty laundry, as Penny says - right away, and before we go to bed.'

The model was in her element as she enjoyed the time with her and Rod's family

The model was in her element as she enjoyed the time with her and Rod's family 

Rod's daughter Kimberly Stewart, 44, also rocked a black bikini for the day at sea

Rod's daughter Kimberly Stewart, 44, also rocked a black bikini for the day at sea

Kimberly showed off her tan in her halterneck number as she strolled around deck

Kimberly showed off her tan in her halterneck number as she strolled around deck

Rod's son Alastair, 18, was seen putting on a rather amorous display with his girlfriend Eloise Darlington, 18

Rod's son Alastair, 18, was seen putting on a rather amorous display with his girlfriend Eloise Darlington, 18

Penny later swapped her bikini for a green and pink floral print cover-up as the family jumped on a dinghy to head to shore
Rod was colourful in his unbuttoned shirt and bold board shorts

Penny later swapped her bikini for a green and pink floral print cover-up as the family jumped on a dinghy to head to shore with Rod

The Sailing singer carried a white cross body bag and flaunted his bling as he arrived on shore

The Sailing singer carried a white cross body bag and flaunted his bling as he arrived on shore

The blended family took to their Instagrams this week to share a slew of sweet snaps from the getaway

The blended family took to their Instagrams this week to share a slew of sweet snaps from the getaway 

When Penny met Rod back in 1999 when she performed as part of his band and he was still married to his second wife Rachel. 

Rachel and Rod separated that year and divorced in 2006, with the singer going on to marry Penny in 2007. 

At the time Rod already had six children, with Penny admitting: 'I knew that I had to be honest with them, too, so that they would accept me. I couldn't pretend to please every single one of them, so I was just myself. It took a while, but they came to trust me.' 

Despite his huge fortune, Rod is determined to make sure his children remain humble, with his and Penny's eldest, Alastair, driving a used Ford Fiesta.

He said: 'As the saying goes, they know the value of a dollar. On his last birthday, we wanted to give him a new car, but he didn't want it. I believe the children are genuinely grateful for the life they have.' 

Rod showed off his colourful Converse as he hit the crowded beach with youngest son Aiden Patrick, 13

Rod showed off his colourful Converse as he hit the crowded beach with youngest son Aiden Patrick, 13

Rod looked tanned as he kept his colourful outfit on for the beach trip

Rod looked tanned as he kept his colourful outfit on for the beach trip 

The group zipped between the yacht and the beach in a speed boat

The group zipped between the yacht and the beach in a speed boat

Rod relaxed on board after an idyllic day with his loved ones

Rod relaxed on board after an idyllic day with his loved ones

Rod hung out with his daughter Ruby's fiancé Jake Kalic

Rod hung out with his daughter Ruby's fiancé Jake Kalic

She showed off her gorgeous curves

She showed off her gorgeous curves

Penny enjoyed a cooling dip in the ocean as the group took a break from the yacht

Penny enjoyed a cooling dip in the ocean as the group took a break from the yacht 

She looked relaxed and happy as she chatted to her step children

She looked relaxed and happy as she chatted to her step children 

Rod was just 17 years old when his girlfriend Susannah Boffey, an art student, got pregnant and the broke couple put baby Sarah up for adoption, where she remained unaware her dad was a star until she turned 18.

His second daughter Kimberly was born in 1979 during his marriage to Alana Hamilton, followed by son Sean.

 They were five and four when their parents broke up in 1984 and Rod was rarely around when they were growing up, too busy touring the world during his formative years. 

The singer also initially had a strained relationship with daughter Ruby Stewart, whose mother is Texan model Kelly, who he started dating in 1983.

The trip comes after Rod and Penny recently discussed the secrets to their loving and successful marriage and how they navigated the unique problems of a 'blended family.'

The trip comes after Rod and Penny recently discussed the secrets to their loving and successful marriage and how they navigated the unique problems of a 'blended family.'

At the time Rod already had six children, with Penny admitting: 'I knew that I had to be honest with them, too, so that they would accept me'

At the time Rod already had six children, with Penny admitting: 'I knew that I had to be honest with them, too, so that they would accept me'

Despite his huge fortune, Rod is determined to make sure his children remain humble

Despite his huge fortune, Rod is determined to make sure his children remain humble

Fiercely loyal to her mother, Ruby remained outside the Stewart family circle until her teens and told an interviewer in 2008 that there was a point when she and half-sister Kimberly weren't even speaking.

Thankfully, Rod had put his wild ways aside when he married Rachel in 1990 - indeed, she is credited as the only woman to break his heart. 

He remained a close father to their children, Renee and Liam Stewart, after the couple's divorce in 2006.

The Maggie May hitmaker married Penny the following year, and many credit her with keeping all the plates of his complicated family spinning happily. 

As she once said in an interview: 'Two kids are the perfect number for me, although I always think of us having eight children because all Rod's kids are so much a part of our lives, like one big extended family.'