It's On!

Kate Hudson and actor Dax Shepard are definitely dating, PerezHilton.com can reveal.

A source close to the couple confirms the relationship news and tell us that the pair are already vacationing together.

Dax and Kate have spent the past few days in Muskoka, Ontario, Canada, where Hudson’s mother, Goldie Hawn, has a house nearby. (Her younger brother, Wyatt, is a hockey player.)

The pair have been spotted cruising around Lake Joseph on a boat and have been very affectionate in public.

Hudson’s son, Ryder, has been seen with the pair.

Things must be serious!