Making a perfect square is 22-year-old Twilight star Robert Pattinson, already rumored to be a "friend" of the 10,000 B.C. actress, also 22.

Photos obtained exclusively by Celebuzz show a bubbly Belle on a day date Sunday with Pattinson in Venice, California.

The casually dressed pair hit Three Square Bakery on Abbot Kinney Boulevard for a spot of lunch and, from the looks of it, some serious quality time.

The two laughed together and strolled the popular street (a haunt to local celebs like Julia Roberts). Pattinson showed some chivalry with little things like opening and closing Belle's car door.

It's not all puff-pastry picnics, however. The pairing could have serious ramifications in the Young Hollywood dating sphere.

On November 12, People magazine reported that 19-year-old Jonas had taken up with Belle, featured in the Jonas Brothers video for their single "Lovebug," on the heels of his split from country phenom Swift.

"It was only after doing the video that [Jonas and Belle] began to date," a source told the magazine, adding that "they are not public about it but they've just been hanging out with their friends and Joe's brothers."

Speaking of being public, 18-year-old Swift wasn't necessarily subtle in her depiction of Jonas' breakup tactics—he cut her loose over the phone—in a MySpace video blog posted November 5.

Four days later, Jonas and Belle turned up on a seemingly romantic retreat to Cabo San Lucas, followed days later by their public outing.

Has Belle already gone from rocker beau to vampire heartthrob?

This could get interesting...

Photo Source: NationalPhotoGroup.com