“Delivery Man,” about a sperm donor, stars Vince Vaughn. His fertility, I don’t know. His lush hair, I know. It beats many sparse Romeo scalps.

“I’ve handled babies,” he said. “My wife and I just had our second. And I’ve helped with everything, all the infant duties.

“This movie has drama, tension, and my character, a person who has to get better, develops the capacity to love. Like all of us, you must learn to accept who you are. I see young people starting out. Taken advantage of. Feeling alone. Not realizing it’s just the popular culture. Everyone has these moments.”

Cobie Smulders is also unlike many leading ladies. Self-effacing. “I got this job with begging, groveling, lots of pleading. Plus, auditions, meetings, finally convincing them to let me do it. I know about babies. My daughter’s 4 ¹/₂. And I support artificial insemination. Our lesbian friends love it.

“My ‘How I Met Your Mother’ series condensed my role one week, then again so I could fly back and forth doing this.” While speaking, she kept schlepping up her Reed Krakoff strapless loaner.

Between guests Valentino in leather and 2008 Olympic champ Nastia Liukin in skirt so short her underdrawers must’ve been inserted surgically, came Erin Gerasimovich. “I’m also in the movie. I’m 8.

“My sister Ashley, 9, was in ‘War Games’ with Naomi Watts. Another sister, 11, models. At this audition they asked questions to see how I’d say ‘no . . . no . . .’ ”

Mama Caroline: “It started when I read about child models and took them. My husband’s an attorney. At home we don’t talk show business. They do public school. Girl Scouts. Gymnastics. Compete for the same jobs, run lines together. But we teach they’ll get the role they deserve. There’s no jealousy . . . only . . . it’s a lot of my running around.”

Lots of celebs to promote

P.R. stuff: Thursday’s some new Bordeaux Under One Roof tryout. Mentioned tasters include Julianne Moore (the p.r. person misspelled her), De Niro, Ed Burns, Jay Z (the p.r. person misspelled him), chefs Todd English, David Bouley . . . Another: Advertised for Miami’s Art Basel Dec. 4: Tommy Hilfiger, Mrs. Hilfiger, Tony Shafrazi, Jason Binn, Mrs. Jason Binn, artist Marc Quinn, deejay Atlanta de Cadenet Taylor, Delano Beach Club, Stoli and Invicta. No room’s left for guests.

Mob rubbed

Testy mob rapper Tony Testa asked “Jersey Shore” creator Anthony Beltempo:

“Why’s my reality show ‘The Family’ get killed?” Beltempo stayed mum. A lawsuit’s threatened because Testa maybe thinks maybe family members maybe earned money over maybe not doing it. Maybe.

Keaton dishes

All this Woody Allen blaahblaah about is-he-is-or-is-he-ain’t Mia’s son Ronan’s father brings up Diane Keaton, who worked with Woody on eight or more movies: “He thinks I’m stupid. He isn’t somebody who runs around making lots of new friends. So I tried to make him like me. So he didn’t have much of a choice. He’ll say he likes me but he thinks I’m an idiot.”

Tips for flying

Booming air travel’s needing more pilots. How to know the one you’ve got is new? If your 747’s got training wheels . . . April brings Plume’s “I Never Knew That About New York.” Author Christopher Winn burbles Manhattanisms. Like: Columbus Circle’s where all to-and-from NYC distances are measured. When Queen Elizabeth visited Trinity Church in 1976, she got 279 peppercorns in back rent. Haughwout Building (who knew there was one) was the world’s first commercial building with a passenger elevator.

Uppear East Side medical office. Reader Francine Winiker reports a patient asked where another’s snappy sunglasses came from. Replied the owner: “Tom Ford. They nearly maxed out my credit cards. He should change his name to Tom UnaFordable.”

Only in New York, kids, only in New York.