New Real Housewife of NYC Named

Credit: Kevin Mazur/; M. Von Holden/

Socialite Sonja Morgan is joining the cast of Real Housewives of New York City, a source tells

Morgan, 45, "is not married," the source tells Us. "You would think they'd get some more married women on the show! It's called the Real Housewives of New York, after all!"

She's a pal of Countess LuAnn de Lesseps, who is also on the show, the insider adds.

A rep for Bravo had no comment.

Bethenny Frankel, who authored New York Times bestseller Naturally Thin and invented the Skinnygirl Margarita, will star in her own Bravo reality series that will chronicle her attempt to balance her career and love life.

A rep for Frankel told Us in July that she intends to wed beau of about 10 months, Jason Hopper.

"I can confirm Bethenny and Jason are in love and plan on getting married," the rep said.