Christina and her fiance Matthew Rutler have offered to host Hillary's last big fundraiser of 2015 at their home in Los Angeles on 4 November (15), reports.

Many celebrities are expected to flock to the event, which falls shortly after the politician's birthday on 26 October (15). Christina is also expected to put on a special performance, according to

The pair previously met at an event in 2012, when the singer was honoured for her work as a United Nations World Food Programme Ambassador. Their meeting made the headlines as a picture from the event showed Hillary looking at Christina's cleavage.

"That looks like it was Photoshopped but it's not. It was a real moment," said the singer of their infamous meeting. "She's such a force in a room. She's got that star charisma and everything about her. I couldn't take my eyes off her, either, so it was mutual."