Nick and Aaron Carter's sister Angel tied the knot with boyfriend Corey Conrad Saturday night in Piru, Calif., the Backstreet Boys singer didn't attend, and instead celebrated his own bachelor party in Las Vegas -- get the details Credit: Courtesy of Rembrandt Flores

A new brother-in-law! Nick and Aaron Carter's sister, Angel Carter, tied the knot with her boyfriend Corey Conrad at Newhall Mansion in Piru, Calif., on Saturday, Feb. 8, Us Weekly can exclusively confirm. The ceremony kicked off in the late afternoon, with one noticeably absent guest -- brother Nick. 

The 34-year-old Backstreet Boy was expected to walk his younger sister down the aisle with his brother, but instead celebrated a joint bachelor and bachelorette party with his own bride-to-be, Lauren Kitt, in Las Vegas. Luckily, her twin Aaron, 26, was still on hand for the ceremony, and the siblings seemed to have a memorable night. A guest of the wedding later posted a picture of the two sharing a sweet moment on the dance floor together.

Model Carter, 26, and Conrad -- who works at sbe Restaurant Group -- got engaged last April. "She said YES," Carter quoted her now husband saying at the time. She also shared a picture of the proposal on her Facebook page.

As for Nick, he also had something to celebrate Saturday night. Engaged since last February, the singer and his bride-to-be partied at the Palms Hotel and Ghost Bar with a group of about 15 friends, an insider told Us. "It's about to go down at @palms just entered the room of ecstasy," he tweeted on Feb. 7, with a picture of champagne and gift bags for each one of his friends. ?