Kate Hudson and Derek Hough were caught making out in public just days before it was announced that the actress had split from Muse rocker Matt Bellamy, an insider reveals exclusively in the new issue of Us Weekly -- get the details Credit: Michael Buckner/Getty Images for The Hawn Foundation

What's there to hide? Nothing, apparently! Just days before Us confirmed that Kate Hudson and Muse rocker Matt Bellamy had split, the actress was spotted making out with Derek Hough in public, an insider reveals exclusively in the new issue of Us Weekly.

The longtime (dance-off!) friends quickly got intimate — and didn't care who was looking — after they arrived at L.A.'s restaurant the Nice Guy at 11 p.m. on Friday, Dec. 5. See photos of Kate and Derek.

They "were totally kissing," an insider tells Us of Hudson, 35, and the Dancing With the Stars pro, 29. "So scandalous!"

Shocking perhaps, but Hudson and Bellamy, who share 3-year-old son Bingham, had already broken up by then. "Kate and Matt have been separated for some time now," a rep for Bellamy, 36, told Us on Tuesday, Dec. 9. "Despite this, they remain very close friends and committed co-parents."

Hudson appears to share the same sentiment. "She says that Matt's a really great guy, but they're no longer together," a pal tells Us. The split "wasn't anything big and emotional."