Lindsay Lohan is converting to Judaism in a bid to prove her devotion to Jewish girlfriend Samantha Ronson.
Although raised a Catholic, the 22-year-old star announced she was planning to change her faith on her Facebook page.
After jetting into London last week, Lindsay joined girlfriend Samantha at the Bar Mitzvah of the DJ’s half-brother Joshua Ronson at the Westminster Synagogue on Saturday.
After taking part in the service, Lindsay then went to the nearby Mandarin Oriental in Knightsbridge to celebrate Joshua’s ‘coming of age’.
Showing her seriousness about converting, Lindsay had also visited the synagogue the day before with Samantha and her designer sister Charlotte.
Entering the synagogue, a photographer asked Lindsay if she was switching religions, to which she replied: ‘I’m trying.’
Updating her Facebook status this week, Lindsay wrote ‘I’m converting’.
Lindsay’s change of religion is sure to surprise her family, who come from a long line of Catholics.
Her great-grandfather John L. Sullivan was one of the founders of the Long Island Pro-Life Party.
Her estranged father Michael Lohan rediscovered his relationship with God during a period in jail and now works as a minister.
Michael said: ‘She’s exploring Judaism right now. She’s explored the Church of Scientology, she tried Kabbalah, and now this.
‘I think it’s just another phase. But either way, she’s involving God in her life, and I’m happy about that.’
Lindsay is currently staying in famous friend Bryan Adam’s house during her visit to London.
As well as religious duties, Lindsay has been spotted doing a spot of shopping on Chelsea’s King’s Road.
The Mean Girls star spent an hour in Wolford, where she bought several pairs of expensive tights, before going to Nobu for lunch.
Since Lindsay started dating Samantha last year, she has grown close to the Ronson family.
At New York Fashion Week last September, Lindsay and Samantha were front row at the latter’s sister Charlotte’s fashion show.
Last year, Samantha’s older brother DJ/producer Mark Ronson also gave his approval of their relationship: ‘My sister and Lindsay make a cute couple, don’t they.’