Arquette Sis: Aiken Ain't Asexual?

6/12/2008 6:13 PM PDT
Rosanna Arquette was shocked Clay Aiken knocked someone up -- until someone explained the only person he got it on with was himself.

Also in L.A.: Sam Ronson went out without galpal Lindsay Lohan, Heidi and Spencer showed up to a party to take a pic and Dave Navarro was out with a chick straight out of a music video ... or porno.

In NY: The Jonas Brothers were mobbed outside their hotel, Mark Wahlberg took a picture with a parrot and Susan Sarandon showed off her fantastic rack.