Los Angeles -- President Obama, closing in on $1 billion in fundraising for his 2012 reelection campaign, headed to Los Angeles on Sunday for one last chunk of Hollywood cash.

Obama will do two fundraisers here, including the celebrity-studded concert Sunday evening at the Nokia Theater expected to feature George Clooney, Katy Perry, Stevie Wonder, Jon Bon Jovi and Jennifer Hudson.

Republican nominee Mitt Romney hasn't announced his September fundraising numbers.

The Obama camp has long maintained that it expects to be outspent by Romney. Speaking to reporters aboard Air Force One on Sunday afternoon, campaign spokeswoman Jen Psaki said they will still hit the fundraising hard. "We're obviously out here making this trip because we don't take anything for granted," she said.

 While Obama’s A-list gatherings in L.A. command more attention, Romney and running mate Paul Ryan actually have held more fundraising events on the left coast, according to The Post’s Candidate Tracker. Romney and Ryan have appeared at a combined 18 events in California since June; Obama and Vice President Biden have been to nine.

Obama's first stop Sunday, at a private residence, is a little unusual. He was scheduled to join former President Bill Clinton to meet with a small group of high-dollar donors who have "maxed out" on their contributions. The event was closed to the press and Psaki, as is usual practice, would not disclose names.

"It's a thank you event for a small group of donors," she said.