Khloe Kardashian had a surprise guest at her one-year wedding anniversary party Monday night: Jersey Shore star Snooki.

Earlier in the night, Snooki (real name: Nicole Polizzi), 22, had been partying with The Spin Crowd star Jonathan Cheban at the Frownies' Beautiful Eyes launch party at FantaSea Yacht Club in Marina del Rey, Calif.

She was "taking shots and pictures," says an attendee. "Everyone was laughing."

Later, she tagged along with Cheban, who attended Kardashian's bash, held shortly after the E! star, 26, renewed her vows with Lamar Odom (which exclusively reported Tuesday morning).

Says a partygoer, "Everyone was dancing until super late!"

Kim Kardashian even posted some photos on her Twitter page.

"What a special night!" she wrote. "Tonight was pure love!"