London, July 15 - Actress Sadie Frost is upset with her boyfriend Kristian Marr for inviting the troubled British singer Amy Winehouse to his birthday party.

Thesun.co.uk reports that Frost and Marr have had an on and off relationship but she is angry with him for spending too much time with Winehouse. Frost agreed to attend his 25th birthday bash at an Italian restaurant in London next Thursday in a bid to rekindle their love.

'Sadie was really excited about getting back with Kristian on his birthday. She has always loved him. But Amy turned him into somebody that wasn't appropriate for her, or her children, to be around,' a close friend said.

'Just when he was getting back to his old self, Amy is back on the scene. Sadie told him if he has an Amy-free birthday she might consider giving their romance another chance,' added the friend.