Jamie Foxx and Katie Holmes are getting ''more comfortable'' in their relationship.

The pair have been rumoured to be in a relationship for a long time but are reportedly keeping their romance so under wraps because they have both been in public relationships before and they understand how difficult it is.

A source said: ''Katie was really letting loose and dancing - they were even kissing each other! ... They're starting to be more comfortable about their relationship.

''They'd both been in public relationships before. They care about each other a lot and they tried to stay as quiet as possible because they didn't want to ruin that ... Jamie brings a lot of joy and happiness into her life. They've definitely become more serious.''

However, Katie's number one priority is her daughter Suri, 11, who she shares with her ex-husband Tom Cruise.

The insider added to Us Weekly magazine: ''She's an amazing mom. She'll choose her family over him any day ... When they're together it works. When they're not, they're on their own. It's what works for them ... Katie found happiness with Katie first. She's worked her ass off since the divorce and she's finally gotten to a place where she's made a name for herself and can be her own person. She's back to her old self and it's great to watch.''

Katie and Jamie's relationship was confirmed recently when the pair were spotted walking hand in hand on a Malibu beach last September, finally revealing they are an item in public for the first time.