Mark Consuelos by Jeffrey Mayer/ WireImage.com Mark Consuelos by Jeffrey Mayer/ WireImage.com

Some of the whitest teeth the good lord ever put into a human mouth will be sparkling on ABC's Ugly Betty. Sources tell me exclusively that Mark Consuelos, the former MISSING star who gets to call supercool Kelly Ripa his wife, will guest-star on this season's third episode.

This is where it gets... interesting. Despite my best efforts, no one is budging as to who Mark is playing or who he will share scenes with. All I have been able to suss out is that he'll be filming on the "Mode" set, and that his character's arrival plays into a major story arc.

Betty fans, I invite you to speculate away. Just know that thus far, Consuelos is booked for only a single appearance. Though that could change. Ugly Betty returns Sept. 25.

Mark, who met his Mrs. when they played lovebirds on All My Children, next can be seen in the Hallmark Channel original For the Love of Grace, premiering Aug. 30. - Matt Mitovich

Crave scoop? E-mail Matt and Mickey at mega_scoop@tvguide.com.