It was Reality TV-palooza last night in NYC -- where Bravo held its annual upfront party with the stars of all of their many trashy-but-addictive shows.

The casts of "Real Housewives" of Atlanta, Beverly Hills, New Jersey, Orange Country and New York were all accounted for -- with red carpet appearances by Lisa Vanderpump, Kyle Richards, Taylor Armstrong, Nene Leakes, Countess LuAnn de Lesseps, Gretchen Rossi, Tamra Barney and many, many more.

Noticeably missing from the "Housewives" crew: Kim Zolciak and Teresa Giudice.

Camille Grammer, who already confirmed she won't return for Season 3 of "Beverly Hills," wasn't in attendance either.

The stars of "Shahs of Sunset," "Top Chef," "Flipping Out" and "Million Dollar Listing" were there too, plus Bravo personalities Andy Cohen, Tabatha Coffey and Kathy Griffin.

It's crazy seeing all the various casts mingle with each other during the party -- like seeing totally different worlds collide!

All the "Housewives" even appeared on Andy Cohen's "Watch What Happens Live" last night for one of the loudest sit downs ever.

And you thought the reunions were crazy!