Lindsay Lohan
Lindsay Lohan and her Russian partner have been dating since December 2015Tim P Whitby/Getty

US actress Lindsay Lohan is reportedly engaged to Russian heir and businessman Egor Tarabasov after a whirlwind romance.

Lohan, 29, and her 22-year-old boyfriend began dating about five months ago. She moved into his London home recently following an Instagram message which said she wasn't "cool enough" for Los Angeles — and posted a photo of herself wearing a paper bag on her head.

Tarabasov even spent Christmas in New York with Lohan's family and won a big stamp of approval.

"He's just a sweetheart," her mother Dina Lohan told the New York Post's Page Six. "He's an only child and I just Face-Timed with them and his mum a few days ago. He's cool and he's very mature for his age. He's older than his years. Being an only child and traveling the world educates you in other ways. He's not about celebrity or anything, which is really important."

Even Lohan's father is happy about the match. "He has a lot of strong connections in Russia – these are big people and they're very supportive," said Michael Lohan. "He wants things to be in the right place for Lindsay and he's wise beyond his years."

There is just one problem: Lohan's spokeswoman insists the couple are not engaged, even though TMZ reported that she definitely is.

In an interview with The Sun last month, Lohan said of Tarabasov: "I haven't known Egor for that long. We've been together for about seven months. He is a great guy. I'm really happy."

I'm not cool enough for LA. #tmp =toomanypawns 👑 #tmz =toomuchzealousness

A photo posted by Lindsay Lohan (@lindsaylohan) on