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Which Manhattan socialite is brave enough to replace Bethenny Frankel on The Real Housewives of New York City?

Ramona Singer won't reveal the mystery woman's name (they begin filming Season 4 next week), but she promises viewers won't be disappointed.

"We have this new girl coming on. She is very happy with herself," Singer, 53, tells "Not to say I'm not going to get pissed at her or have a fight with her about something -- that's just who I am sometimes! I can't help it. But it's better I tell it to your face then behind your back, right?"

And viewers who'll miss Frankel's candid commentary on the show don't have to worry: she'll be back for the new season, but only for "cameo appearances, just like I did on her show," says the Bravo star, who will debut her Ramona Singer HSN jewelry line on the network September 20 from 3-5 P.M.

"She isn't leaving totally," Singer tells Us. "We are intertwined in a sense. She proved to Bravo you don't have to have table-flipping to get ratings."

After a tension-packed third season, Singer says she's looking forward to "no drama" this time around.

"I just hope Kelly [Killoren Bensimon] doesn't have a worse breakdown on this show like she did last season," she says.