HOLLYWOOD, NEW YORK & AROUND THE WORLD -- Thursday, December 4, 2008 in NYC -- Lindsay Lohan and girlfriend Sam Ronson made it a point to hit every hot party... they started out the night by spreading some Christmas cheer at the MySpace Holiday Party at hotspot Tenjune. Sam DJ'd the party while Lindsay spent some quality time with mom Dina and the Tenjune owners...

Tons of more sightings... after the jump!

NEW YORK, HOLLYWOOD, CHICAGO & BEYOND... -- Thursday, November 6 in LA: Hayden Panettiere, Nicole Richie, Drew Barrymore, Heidi Klum, Donald Sutherland, Lucy Liu, Fergie and Ryan Seacrest, among many more, watched Madonna perform with Britney and later Justin Timberlake at Dodger Stadium... Emilio Estevez, who just signed on for a guest appearance on "Two And A Half Men" sitting in the foyer Thursday mid-morning at Shutters Hotel in Santa Monica....

In San Francisco: Ashton Kutcher and MC Hammer celebrated MySpace Music's recent content channel launch, with a party featuring a performance by R&B legend Lionel Richie, who sang his classic hits, including "All Night Long" and "Brick House -- DJ AM also performed...

The rest of this week's celebrity sightings inside!

In a year that recognized an array of artists and creative professionals across numerous styles, the nominations celebrate and spotlight a unique mix of established and emerging artists. The 9th Annual Latin Grammy Awards, set for Nov.13 at Toyota Center in Houston, will be broadcast live on the Univision Network at 8 p.m. ET.