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Kellan Lutz

Courtesy of Alexander Tamargo/Getty Images for AUDI

Underwear model and Twilight vampire Kellan Lutzturned 25 yesterday and was surprised with a soiree at his Sherman Oaks house.

The bash was planned by his brother, who asked guests to park down the street to avoid Kellan catching on.

"It was just his close friends and family," a source tells me of the low-key evening. "They had a BBQ and drinks and asked guests to bring something, too."

Brittany Snow and her boyfriend attended the bash, but Kellan's on-off girlfriend AnnaLynne McCord wasn't there.

How come?

She's currently in Texas for the South by Southwest festival.

The couple's still on though...for now. They recently took a trip to San Juan, Puerto Rico, together to participate in Roselyn Sanchez's Triathlon for Life.

Kellan got the party started early last weekend with some help from Twilight costar Ashley Greene when they hit Coco de Ville Friday night with a group of friends.

See more star soirees in our Celebrity Birthday Bashes gallery!