‘Real Housewives of NYC’ costar talks 100th episode: Expect drama

You’ve come a long way, ladies.

Tuesday night’s episode of Real Housewives of New York City is a biggie — the Bravo reality show’s 100th (it airs at 9 p.m.).

To celebrate, the comely cast moved the dramatics over to Turks & Caicos, where — surprise, surprise — an epic meltdown ensues.

As a teaser shows, consensus is that Sonja Morgan has a drinking problem and a few of the socialite’s “friends” stage a beach-side confrontation that looks sort of like an intervention, only with chaise lounges and bikinis.

LuAnn de Lesseps said she tried her best to rise above all the yelling and crying (warning: Ramona Singer and Bethenny Frankel shed more than a few tears over their failed marriages to Marco Singer and Jason Hoppy, respectively).

“We filmed a year ago so their breakups were really fresh,” says de Lesseps by phone. “The drama does escalate, but there was a lot of fun on the trip too. It’s a beautiful place and we had an amazing house.”

The statuesque former model and clothing designer ( The Countess Collection, which she describes as “chic, easy and affordable,” is sold on evine.com) has another reason to celebrate.

Her third single, Girl Code, drops Wednesday. De Lesseps performed it on Watch What Happens Live! last week with her daughter, graphic artist Victoria (with ex-husband, Count Alexandre De Lesseps). Host Andy Cohen called the ’70s inspired ditty the “song of the summer.”

Besides the funky beat, apparently, there’s some meaning behind it. Listen to the lyrics: “I’m the girl who’s always loyal to the end. People come and go but I’ll always be your friend ... Don’t be so uncool.”

Though LuAnn didn’t comment on who the track was about, rumor has it the etiquette author wasn’t pleased that castmate Carole Radziwill began dating LuAnn’s sexy personal chef Adam Kentworthy because he also happens to be the ex of LuAnn’s niece. Oy, meow.

“No one’s really done a song about the so-called girl code,” says de Lesseps about the practice of not hooking up with another pal’s ex. “It’s multi-generational and has gone on since, well, forever, and will through the end of time.”

As one of the stars of the RHONYC since it first started up in March 2008, de Lesseps believes she has evolved.

“I feel like I’ve been through so much. I’ve seen my [two] kids grow up. I’ve grown up, too. I’ve gone through divorce and came out the other side. This is a documentary of my life. It’s why I’m glad I decided to do the show.”

As for turning the big five-oh last month? No big thing.

“I’m really happier than I’ve ever been,” says the so-called Housewife. “Fifty’s the new 30, honey. If I weren’t so happy, I’d be mortified, I guess! I’m in a good place.”

Expect LuAnn back in our neck of the woods come December for Art Basel. Last year, Victoria showed some of her artwork in Miami and de Lesseps is hoping the 20-year-old will have another exhibit.