Amy Sancetta/Invision/AP 1 / 8
Amy Sancetta/Invision/AP 1 / 8

As reports fly that Reese Witherspoon has a new flame in CAA agent Jim Toth, Jake Gyllenhaal has suddenly become Mr. Popularity with the ladies.

First up: his hang-time last weekend with G4 hottie Olivia Munn, who was most recently linked with "Star Trek" captain Chris Pine. E! News reports Gyllenhaal chitchatted with the dark-haired looker during Saturday's Night Before Oscars bash at the Beverly Hills Hotel after being introduced by mutual pal Jamie Foxx (huh, random).

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"Once they met, Jake didn't leave her side the entire night," relays a spy. "They looked like they were having fun, both laughing a lot."

The pair later moved their tête-à-tête to Soho House, but, a mole downplays, "nothing happened romantically." Still, they supposedly exchanged digits with an eye toward getting together "soon."

Meanwhile, armchair matchmakers are attempting to will a relationship between Gyllenhaal and his Oscar night co-presenter, Rachel McAdams, into existence.

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Sure, they looked adorable onstage, but is there potential for a love connection, or is this just a case of the public casting around for a new dream couple who we can dub with an annoying nickname (we're partial to McGyllenhaal)?

The evidence remains circumstantial, at best: During a backstage interview with Oprah regular Nate Berkus, the buzz cut-sporting star of the forthcoming big-budget flick "Prince of Persia" held the actress's pink purse. Also, he introduced her to a pal by joking, "This is Rachel McAdams, she's the mother of my child!"

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Life & Style adds that McAdams had her sister switch seats in the audience so she could sit next to Gyllenhaal and (fresh breath alert!) popped a mint in her mouth while sharing a laugh with him.

Like we said, circumstantial at best.

Meanwhile, is Rachel's ex-boyfriend and "Notebook" leading man, Ryan Gosling, moving on? Head over to the Romance Report for more on that ...

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