As reports surface that Bachelor Jake Pavelka cheated on fiancee Vienna Girardi with an ex, the couple put on a united front Thursday in West Hollywood.

Holding hands, Pavelka, 32, and Girardi, 23, smiled and greeted photographers as they left The Palm Restaurant where they dined following an appearance on Jimmy Kimmel Live!

Asked to comment on his alleged ex's claims, Pavelka shrugged his shoulders and shook his head.

"Nah," he replied.

Although Pavelka's alleged ex has yet to reveal her identity, both TMZ and RadarOnline report that the woman is 24-year-old Tanya Douglas. (TMZ even posted a photo.)

In a statement Thursday, Pavelka said, "It is unfortunate that people such as this are trying to financially capitalize on or disparage my incredible relationship with Vienna. I only wish everyone could be as happy for us as we are happy together."