Inside Kate & Owen's Hookup
02/28/2008 AT 02:20 PM EST
As PEOPLE reports in its new issue (on newsstands Friday), the pair flirted at Madonna's exclusive post-Oscar party Sunday night. Spotted by an onlooker near the souvenir booth, "There was lots of arm touching, giggling," says the eyewitness. "They were having lots of fun."
Adds another observer: "They were all over each other."
The day before the Oscars, Wilson, 39, and Hudson, 28, met up twice – spending time at each other's homes.
– Jennifer Garcia, Jeffrey Slonim and Pernilla Cedenheim