Katie Holmes and Jamie Foxx are the "worst kept secret in Hollywood" say sources.
The two stars were first linked last summer when they were spotted dancing together at a Hamptons gala.
Friends say they haven't gone public with their relationship because they still don't feel ready.
"It's the worst kept secret in Hollywood. When they were first linked last August they weren't ready to make their relationship public. They were both worried about Tom's [Cruise] reaction - after all, he introduced them when he was still married to Katie," a source divulged to British magazine Grazia.
Katie's high profile marriage to Tom Cruise ended in a 2012 divorce. They have seven-year-old daughter Suri together.
Although it's not known if Jamie has met Suri yet, friends say 35-year-old Katie always makes time to keep in constant contact with the Django Unchained actor.
"When they're apart Jamie and Katie text, call and Skype each other all the time and they meet up whenever they're in the same city. When he's in New York he sends a car to pick her up and they meet at a private apartment, everyone is desperate for them to go public," the source added.
Last week stories surfaced claiming the pair had spent time together over the Super Bowl weekend earlier this month.
There were further claims that they'd met up in Miami over New Year and even that Katie had spent time at Jamie's California mansion during a trip in January.
In October Jamie, 46, laughed off the romance rumours, saying they were "one hundred per cent not true".
"In fact, it's quite hilarious because we simply danced at a charity event along with a lot of other people," he told Entertainment Tonight.