Katie Holmes has reportedly enjoyed a string of dates with George Clooney.

The 34-year-old actress - whose recent romance with her Mania Days co-star Luke Kirkby is said to have "fizzled out" - was a guest at the hunky actor's Gravity premiere in New York earlier this month and came after the pair enjoyed several intimate dinners after bonding at a friend's recent dinner party.

"Katie and George have known each other for years. They met through her ex-husband Tom Cruise and have always got on. Katie has had a crush on him for ages. They're both single and have met up a couple of times since the dinner party. Katie really has her sights set on him. There is a genuine connection," a source said.

However, insiders insist that the romance isn't serious: "Katie and George are having a lot of fun. They are enjoying their new flirtation. He's a fun guy with buckets of charisma and Katie loves his company."