Credit: Steve Granitz/

Kristen Stewart clearly thinks boyfriend Robert Pattinson is a rock star!

The Twilight actress, 21, shelled out $12,000 to purchase two vintage guitars for her beau, 25, from Norman's Rare Guitars in L.A.'s Tarzana area.

Snapping up the instruments on December 23, just in time for Christmas, Stewart knew Pattinson would be impressed with her purchase.

"She said 'He's gonna s--t when he sees them!'" the shop's owner, Norman Harris, tells Us Weekly of Stewart, who strummed a guitar herself during her shopping session.

The guitars -- a 1959 Fender Jazzmaster and a 1947 K&F Lap Steel -- will be put to good use, as Pattinson plans to record an album.