"Extra" host Mario Lopez is set to wed his baby mama Courtney Mazza this weekend in Mexico, and his bride-to-be gave him one heck of a surprise for his bachelor party -- herself!

Mario and 15 of his closest pals settled in for a performance at the Pussycat Dolls show at Planet Hollywood in Las Vegas, when an unexpected performer took the stage -- his former-dancer fiancée! Of course, "Extra" cameras were along for the ride.

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To say the former "Saved by the Bell" star was shocked is an understatement.

“I was totally surprised," he gushed after the performance. "It was a pleasant surprise and I'm still kinda blown away. I loved it, she looked hot, she was amazing. I don't know about my friends checking her out but... she...it was awesome.”

Watch the full video above for more moments from Mario's bachelor party, plus tune in to “Mario and Courtney’s Wedding Fiesta” on Saturday, Dec. 8 on TLC to see all of the wedding prep (and hopefully the big day)!

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