Grace Kelly’s glam granddaughters show off bikini bodies

It’s all smooth sailing for these glamorous royals.

Hollywood goddess-turned-princess Grace Kelly’s stunning granddaughters are soaking up the sun onboard a private yacht in France.

Camille Gottlieb and Pauline Ducruet — who are the daughters of Princess Stéphanie of Monaco — showed off their close bond in a series of snaps posted to Instagram on Thursday.

Gottlieb, 24, cozied up to her half-sister Ducruet, 28, as their luxury vessel sailed by the resort town of Villefranche-sur-Mer on the French Riviera.

It appears the pair went without their famous mom, 57, who is currently 14th in line to the Monegasque throne. There was also no sign of their older brother Louis Ducruet, 29.

Both Gottlieb and Ducruet have inherited their late grandmother’s passion for fashion, with Gottlieb becoming a prominent influencer on Instagram, where she shows off her designer wardrobe.

The blonde — who bares a striking resemblance to her “To Catch A Thief” star gran — has racked up more than 90,000 fans who fawn over her envy-inducing outfits.

Ducuet, meanwhile, is the founder of “inclusive and sustainable” fashion label Alter, which sells chic gender neutral designs. The brunette is also the subject of an upcoming documentary, “Forming,” about her life as a working royal.

The half-sisters both appear to have been inspired by the glamorous grandmother.

Kelly — born in Philadelphia in 1929 — was widely considered one of Hollywood’s most glamorous actresses in the 1950s, fronting films such as “High Noon,” “Dial M for Murder,” and “Rear Window.”

The statuesque star won the Oscar for Best Actress for her role in “The Country Girl” in 1954 — a year before she met Rainier III, Prince of Monaco during a trip to Europe.

Kelly subsequently stopped appearing in Hollywood movies, marrying the prince in 1956. The pair went on to have three children, Albert, Caroline and Stéphanie.

The beauty — who had become one of the most famous women of the 20th century — died following a car crash in 1982. She was just 52 years old.

Granddaughters Ducruet and Gottlieb never known their superstar nan, as they were born more than a decade after her death.

Ducruet — who is currently 16th in line to the Monegasque throne — was born in Monaco back in 1994.

The brunette is the second child of Princess Stéphanie and her now ex-husband, bodyguard, Daniel Ducruet.

The pair divorced in 1996, before Stéphanie subsequently started a relationship with another bodyguard — Jean Raymond Gottlieb.

The princess became pregnant and welcomed daughter Camille Gottlieb in 1998.

Despite being the granddaughter of Princess Grace of Monaco, Gottlieb is not in the line of succession as her parents never wed Princess Stéphanie split with Jean Raymond Gottlieb in the late 1990s.

She is now currently thought to be single, as are her two daughters. Neither Gottlieb or Ducruet have posted publicly about any possible partners.

Gottlieb and Ducruet are just two of Grace Kelly’s 11 grandchildren.

The sisters have generated far less press coverage than their other cousins — many of whom are closer in line to succession.

Kelly’s 7-year-old grandson, Prince Jacques, is currently first in line to throne. His twin sister, Princess Gabriella, is second.

Meanwhile, Grace Kelly’s other grandchildren, Andrea Casiraghi, Pierre Caisraghi and Charlotte Casiraghi are 4th, 8th and 11th in line respectively.

Granddaughter Princess Alexandra of Hanover, 23, is currently 13th in the line of succession.