Mary-Kate Olsen and Olivier Sarkozy share lunch with Ashley Olsen at Sant Ambroeus in New York

Mary-Kate Olsen and Olivier Sarkozy are still together after six months despite their twenty year age difference.

The pair shares a palatial East Village love nest bought by Olivier Sarkozy earlier this year.

And now it appears Ashley Olsen is embracing the couple’s relationship and welcoming Olivier Sarkozy into the fold.

Ashley Olsen was spotted sharing lunch with her sister and Olivier Sarkozy at upscale eatery Sant Ambroeus in New York City’s West Village on Saturday.

The fashionable trio caused a stir at the venue.

Olivier Sarkozy looked casual in plaid shirt and jeans, while 26-year-old Mary-Kate opted for an all black look of leather pants, boots and jacket, complimented with a flowing scarf.

Ashley Olsen blended in, looking relaxed in flats, jeans and a pink cashmere coat.

Meanwhile Olivier Sarkozy’s ex-wife Charlotte, whom he divorced last year, has branded his relationship with Mary-Kate Olsen as “grotesque”.

Yet by all appearances, the cavalier half-brother of former French president, Nicolas Sarkozy isn’t concerned with the criticism.

He appeared in a jovial mood as he chatted with assorted friends while smoking a cigarette outside the eatery.

Meanwhile, dating older men seems to run in the family for the pint-sized uber-rich actresses-turned-fashion designers.

Mary-Kate’s twin sister Ashley Olsen was 21 when she dated biking super star Lance Armstrong who was 36 at the time – a 15 year age difference.

Olivier Sarkozy is divorced and has two children with his ex-wife Charlotte, and he is the managing director of the Washington, D.C. based Carlyle Group.

Mary-Kate Olsen also has a history of dating high profile men.

She was linked romantically to Heath Ledger before his death and dated Greek shipping heir and Paris Hilton’s ex Stavros Niarchos.