ContactMusic — Katy Perry promised to have sex with whoever bought her signed guitar.The 'Teenage Dream' hitmaker joked she would throw in some x-rated extras... more info

E! Online — Katy Perry will do anything for a good cause. She'll even offer to have sex with you for the right price. OK, maybe not, but last night at the American Foundation for AIDS... more info

Starpulse — Bosses at the American Foundation for AIDS Research (amfAR) have thanked Katy Perry after the pop star agreed to donate a guitar to the charity's upcoming auction. The I Kissed a Girl hit-maker p... more info

ContactMusic — Bosses at the American Foundation for AIDS Research (amfAr) have thanked Katy Perry after the pop star agreed to donate a guitar to the charity's... more info

Big Apple Music Scene — • This picture of Joe Manganiello dressed as a firefighter will make your mouth water. (Celebuzz) • Sure, Russell Brand inviting ex-wife Katy Perry's parents to his party might be weird, but he's 10 years sober and that's awesome! (Celeb Dir... more info

411 Mania — She was there for 30 mins... more info

ContactMusic — Katy Perry's former boyfriend Johnny Lewis has been laid to rest.The Sons of Anarchy' actor - who died following a mysterious fall from the roof of... more info

Perez Hilton — As if attempting a relationship with John Mayer isn't scary enough! Katy Perry recently decided to once again call it quits with the singer after failing to curb his womanizing ways, but apparently, she's not taking the split TOO hard, as she was spo... more info

ContactMusic — Katy Perry, Jennifer Hudson and Stevie Wonder were among the star names to perform at a fundraiser for President Barack Obama's democrats at a... more info

People.com — Plus: More star sightings! more info