Former Bachelor star Sean Lowe celebrated his birthday at 1 OAK Nightclub in Las Vegas with fiancee Catherine Giudici (Photo credit: Bryan Steffy / WireImage / www.BryanSteffyPhoto.com).

Photo credit: Bryan Steffy / WireImage / www.BryanSteffyPhoto.com.
Also at the club, was actress Briana Evigan and her dad Greg Evigan. Briana posed with Sean and Catherine for a photo.
Lowe and Giudici are tying the knot in a live TV special on ABC on Jan. 26, 2014.

Photo credit: Bryan Steffy / WireImage / www.BryanSteffyPhoto.com.

Photo credit: Bryan Steffy / WireImage / www.BryanSteffyPhoto.com.

Photo credit: Bryan Steffy / WireImage / www.BryanSteffyPhoto.com.

Photo credit: Bryan Steffy / WireImage / www.BryanSteffyPhoto.com.

Photo credit: Bryan Steffy / WireImage / www.BryanSteffyPhoto.com.

Photo credit: Bryan Steffy / WireImage / www.BryanSteffyPhoto.com.