Robert Downey Jr. is probably the only straight guy who can pull off a jacket this sparkly, while Chris Hemsworth can make any ensemble look hot!

The stars came out for the NYC premiere of The Avengers on Saturday afternoon, which was also the closing film at the 2012 Tribeca Film Festival this year.

The upcoming action flick retinues the best of the Marvel Comic heroes, and while the film wont be released until next week, festival organizers gave tickets to real-world heroes at this weekend's premier, including "members of the police department, firefighters, U.S. military, and first responders,” according to the film's press release.

How stunning does How I Met Your Mother star Cobie Smulders look in that Reem Acra Spring 2011 orange gown?

Iron Man and Black Widow have never looked so good!

The Avengers stars Robert Downey Jr. and Scarlett Johansson were all smiles in Russia while promoting their upcoming action flick.

The twosome posed on top of Ritz-Carlton Hotel in Moscow. We're lovin' ScarJo's skinny black pants.

Click thru to see the entire cast including Jeremy Renner, Chris Hemsworth and Mark Ruffalo.

Robert Downey Jr. and his wife Susan are the proud parents of baby boy, Exton Elias.

The little bundle, weighing 7lbs. 5 oz., was born in Hollywood at 7:24am on Tuesday, their rep confirms.

Downey, 46, recently told Jay Leno:

"I don't wanna be presumptuous," he said. "But I think actually [the pregnancy] has been tougher on me [than Susan!]... Just the hormones on and the mood stuff and the nausea and the whole thing."

Careful, Robert! The Sherlock Holmes actor is also the dad to 18-year-old son, Indio.

Proud papa-to-be Robert Downey Jr. was beyond proud to show off his wife Susan Downey's pregnant belly at the Sherlock Holmes: A Game of Shadows premiere.

The couple recently announced they're having a boy! Downey already has an 18-year-old son, Indio, with ex-wife Deborah Falconer.

Director Guy Ritchie held on tight to his gorgeous gal Jacqui Ainsley ... who just gave birth to their son three months ago. Whoa!

As for their on-screen ladies ... Rachel McAdams stunned in a shimmery Marchesa dress paired with Christian Louboutins and Amber Heard opted for a menswear-inspired ensemble. Dude looks like a lady ... clearly!

We're not sure if this is part of a scene from The Avenger or if Mark Ruffalo's fist-pumping because he's excited about Robert Downey, Jr.'s wife being pregnant!

The cast of of the Marvel film is going full-force in NYC's Central Park, shooting the upcoming superhero film due out May 4, 2012.

Click thru to see a teaser trailer for the film ...

Producer Susan Downey, wife of Robert Downey Jr., is pregnant, her rep confirms to X17online!

Susan, 37, and Robert, 46, have been married for six years. They met on the set of the movie Gothika. The pair confirmed Wednesday that their first child together would be born early next year.

Downey Jr., 46, has a son Indio, 17, with ex-wife Deborah Falconer.

The actor said last year that he was hoping to have a child with Susan soon -- and that he wants a girl!

Congrats to the happy couple!

Robert Downey Jr. and his wife Susan were spotted shopping on Monday evening, and the box office superstar flashed X17 photogs his sexy smile before driving off in his Bentley.

RDJ is currently filming the yet-to-be-titled Sherlock Holmes sequel, and before we get to see him slip into his Iron Man suit for the Avengers movie in 2012, he's reportedly set to star in How To Talk To Girls, which is based off of child author Alec Greven's book of the same title. Click after the jump to see the hilarious YouTube video of Alec promoting his book -- he was just 9 years old when he penned the piece on wooing the ladies!

If only these two had been BFFs! Robert Downey Jr. is hitting the talk show circuit to promote Due Date and last night David Letterman asked him about Charlie Sheen. "We were in high school together," said RDJ. "We didn’t really hang out. I mean, it sounds like we could have really partied."

And does Downey have any words of wisdom for the fellow actor? "He's a grown man, what am I gonna say? The only advice I would give him is, you know, don't get arrested."

Watch the vid above!