Mary-Kate Olsen reportedly rejected Olivier Sarkozy's first proposal.

The 27-year-old star has sparked rumours she's engaged to her beau after she was spotted wearing a ring last week, but a friend of the couple admits the French banker, 44, popped the question months ago and the blonde beauty turned him down at the time.

A source told Us Magazine: ''He tried about a year ago, and she wasn't ready. She didn't need to be wined and dined. She wanted to make sure he would be good to her.''

The couple - who first started dating in 2012 - are also reportedly ''talking about trying to get pregnant''.

However, the former child star won't have any problems adapting to motherhood as she is already close to Olivier's children Julien, 12, and Margot, 10, whom he has with his ex-wife Charlotte Bernard.

A source said previously: ''Mary-Kate has made him a better father. She remembers all the kids' special events. She thinks he's a great dad.''

Meanwhile, Mary-Kate's twin sister, Ashley, is also dating an older man, with it recently confirmed she is seeing 47-year-old 'Moneyball' director Bennett Miller.