Backstreet Boys star Nick Carter skipped his sister's wedding in California on Saturday (08Feb14) to celebrate his own impending nuptials with his fiancee in Las Vegas.

The pop star was noticeably absent as his family, including younger brother Aaron, joined model Angel Carter at her wedding to Corey Conrad at the Newhall Mansion in Piru, reports

Instead, Nick headed to Sin City with his fitness expert partner, Lauren Kitt, to throw a huge joint bash at the Ghostbar venue.

The couple combined its bachelor and bachelorette parties, and the singer documented the night in a series of pictures posted on his page.

Carter proposed to Kitt last February (13).