Owen "Pretty Upset" Over Kate & Lance

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Kate Hudson and Lance Armstrong are still going strong with their new romance, but one person who's not as happy about it is Owen Wilson.

The actor, who went officially off-again with Kate a few weeks ago, isn't taking his ex's rebound relationship too well, according to clubgoers who spotted him at club G in Philadelphia.

"Owen looked pretty upset," an eyewitness tells OK!. "He was drinking and sulking until last call."

Besides drowning his sorrows in alcohol, the 39-year-old, who attempted suicide in August following his split with Kate, has turned to little brother Luke for support.

"Owen's been spending time on the phone with Luke," a Marley & Me set source tells OK!. "There are a lot of people making sure they're there for him."

What's worse, Kate's new fling didn't just take Owen by surprise, but his friends as well, who expected the heartbreak to be the other way around.

"We all thought it would be Owen breaking Kate's heart, but it turned out to be the other way around," a pal of the two tells OK!. "It's sad because deep down they love each other -- but they're too lethal a combination to last. And Kate has her son, Ryder, to think of."