Jennifer Flavin upstaged the muscle man himself on Monday, when she displayed her impressively sculpted bikini body on their yacht.

Sylvester Stallone’s wife of 18 years was tanning in a teeny black bikini when she appeared to cut the figure of a woman half her age, with serious tone.

The 46-year-old model and actress, along with her daughters, husband and even the dog, were enjoying some out at sea in South of France as they mark Sylvester’s 69th birthday.

Sculpted: Jennifer Flavin showed off her impressive form as she helped husband Sylvester Stallone celebrate his 69th birthday in South of France

Jennifer certainly didn’t look like the time was ticking away herself, when she perched on the side of an inflatable raft to watch daughters Sophia, 18, Sistine, 17, and 13-year-old Scarlet Rose enjoy a paddle board in the ocean.

She had gym-honed muscles to rival her Rocky Balboa beau, displaying not even a crease at the middle as she dangled her feet in the water.

A skimpy drawstring bikini softened her rock hard physique and with her hair tied up in a fuss free bun, the beauty was suitably holiday ready.

Athletic: 17-year-old Sistine showed that she too had athletic prowess and balanced effortlessly on a paddleboard

Watching on: Sylvester hung out on the boat, watching the family hit the waters

Holiday ready: Scarlet Rose wore the season’s hottest trend when picking out her swimwear

Aspiring model Sistine looked tropical in an lilac-coloured two piece as she too displayed her athletic prowess while balancing with ease on a paddleboard.

 

Even the family dog was kitted out in a water proof jacket as he stood proud on one of the flotation devices to keep a look at the action.

Later on, to complete an action-packed day, Jennifer and her daredevil girls slipped into the wetsuits and enjoyed diving from the side of the luxury liner.

 

The family have gathered to celebrate Sylvester’s penultimate birthday in his sixties.

Impressive: At 46, Jennifer looked impressively sculpted as she balanced on an inflatable raft

Fun times: The family seemed to be enjoying a gorgeous time on the water

Family fun: The model and actress watched her girls take to the water

Toned: She displayed her pert bottom in a tiny black drawstring bikini when hitting the water

Getting the giggles: Perched on the edge of the water, Jennifer didn’t even display a crease at her middle

Previously, the five-piece had been in Venice where they took to the water once again and spent the afternoon exploring the riverways on Gondolas.

Captioning a sweet picture with his girls earlier in the weeks, doting dad Sylvester wrote: ‘Enjoying life with my beautiful daughters.’

 

The celebrations seem to just keep going, especially considering it’s been 7 days since the hardman rung in his 69th.

Sylvester shows no signs of slowing down either because his latest acting appearance will hit movie theatres on November 25th, 2015 as he takes on a role in Rocky spin-off Creed.

Top form: She seemed to have impressive athleticism about her when she scaled the raft

Gorgeous: A black drawstring bikini softened her rock hard physique on holiday

 

Family time: Jennifer seemed to want to sped time with her family as they marked her man’s big birthday

Watching on: Protective Stallone kept a watchful eye over the girls as they enjoyed the sporting

He’s ready too! Their family pooch even got a look in on the action in his life vest

Still got it: The Rocky actor looked ripped as a wet T-shirt clung to his physique

Muscle man: He had been taking a dip in the water when he decided that he’d had enough for the day

Still slim: Even in a hard-to-wear wetsuit, Jennifer showed off impressive form

More watersports: The girls didn’t seem to stop all day, enjoying plenty of watersports and activities

Similarly, it’s only one month before Jennifer marks her 47th birthday – though it’s still distinctly hard to believe.

And middle daughter Sistine is closely following in her footsteps when it comes to modelling.

Sylvester has been keenly helping her pursue a career in front of the camera by recently accompanying her to New York to work with esteemed photographers.

The 17-year-old is currently on IMG models’ books, as well as NYC l.a. models management and has 24.9k followers on photo-sharing site, Instagram.

Catching the rays: Jennifer lay out to catch some sun on Monday afternoon

Daredevils: The girls jumped off the side of the boat from a very high height

Time of their lives; An aide took pictures from one side as the girls threw themselves off the liner

Catching some sun: Sitting on the side of the yacht, their dog was enjoying the sun too

Hanging out: Jennifer and Sylvester spent some time alone together in the water

Young at heart: Sylvester took some time out with the children in the water

Chatting away: Away from the girls, Sylvester took some lad chat with one of the men on board

Still fit: Sylvester proved that at 69 he was still in peak physical fitness

Having a great time: He smiled to prove that his birthday had been a pretty enjoyable one

Drawn out: He may have marked his birthday over a week ago, but the muscle man is still celebrating

Water babies: At one point, the whole family were out in the water in Southern France

Big birthday: Previously, the family had been in Venice celebrating

Not a day over 50: At 69, he showed no signs of slowing down

Just keep swimming: Rambo actor Sylvester seemed to have all of the right equipment for the water

Fighting fit: Sylvester appears in a Rocky spin-off Creed later this year

Night out: Later on the boat, the family scrubbed up for another evening of entertainment

Toasting; The girls enjoyed drinks out of flutes to help their father celebrate

Keeping contact: Even on a boat, Sylvester needed to be connected to dry land

Staying up date: No doubt Sylvester couldn’t take his mind off business for the family holiday

Happy couple: The duo have now been married for a very happy 18 years

Giggles: The family event proved to be a laugh a minute for all involved