Christina Aguilera was publicly kissing her new boyfriend following the UK premiere of her movie 'Burlesque'

The 29-year-old singer ' who is currently divorcing husband of four years Jordan Bratman ' couldn't fail to hide her intimacy with Matthew Rutler, a set designer she met on the set of the film, at London's Floridita club last night (13.12.10)

A source said: 'She seemed really relaxed, she was enjoying Matt's company and wouldn't let go of him while she was outside of the VIP section of the club.

'As soon as she got into the VIP area she was drinking and dancing, even roping in co-stars Kristen Bell and Chelsea Traille for a saucy routine to her song 'Ain't No Other Man'.'

Though the blonde beauty was happy to pose for pictures with fans at the premiere's afterparty, she was reluctant to chat too much and brushed off questions about her personal life.

The insider added to BANG Showbiz: 'She was in great spirits, although when fans tried to talk to her about her personal life she didn't seem so keen to talk, with one she stayed totally silent, although she still agreed to have a picture.'

Matt seemed to be keen to protect his girlfriend, keeping an arm around her at all times while they were talking.

Cher, who stars in the film with Christina, was unable to make it to the party because of filming commitments for a British TV show.