Reese Witherspoon, Ryan Phillippe, Amanda Seyfried

Steve Granitz/; Andrew H. Walker/Getty Images; Jon Kopaloff/FilmMagic

Exactly when sparks flew between Ryan Phillippe and Amanda Seyfried is hard to tell.

While Seyfried was spotted leaving Kate Hudson's Halloween party on Saturday night with Phillippe and then snapped by paparazzi leaving the hunky actor's home the following morning, sources tell me…

The two weren't exactly bosom buddies inside Hudson's bash. "I didn't see Ryan with Amanda at all," one fellow partygoer reports. "He was wandering around alone most of the night."

Funny enough, guess who else was at the star-studded party? Phillippe's ex-wife, Reese Witherspoon, and her boyfriend, Hollywood agent Jim Toth. No word if Phillippe exchanged any pleasantries with the couple, but it wouldn't really be a surprise if he did. Just last weekend, the former spouses came together to throw their son Deacon's seventh birthday party in L.A.

Meanwhile, the partygoer says Hudson's costume was inspired by Inglourious Basterds.

Leonardo DiCaprio (in a baboon mask) and some friends (including one as Ronald Reagan) also turned out. "They didn't take their masks off all night," our source says.

Nicole Richie came as Margot Tenenbaum, Gwyneth Paltrow's character from the quirky 2001 flick The Royal Tenenbaums.

Guests danced until about 3 a.m. (the DJ played a lot of '80s music) and enjoyed jalapeno poppers, chips and guacamole and quesadillas along with burgers and fries from a Fatburger truck.

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