Adam Levine and Behati Prinsloo Spotted Making Out During Begin Again After-Party—Plus, Will He Sing at Their Wedding?

Find out what the actor had to tell E! News about his big day!

These two lovebirds just can't get enough of each other!

An eyewitness tells E! News that Adam Levine and Behati Prinsloo were all about the PDA last night at the Begin Again premiere after-party, which took place upstairs at The Bowery Hotel in New York City.

The soon-to-be newlyweds snuggled up to each other at the back of the venue, with Levine drinking a bottle of sparkling water while his lady (who opted to ditch her heels and go barefoot for the rest of the evening) sipped on some red wine.

At one point, Behati decided to get up and mingle, so she went to go outside and blew Adam two kisses, before he blew one back (so cute!).

The Maroon 5 frontman joined his fiancée outside shortly after she left his side, and the duo began talking with his co-star Keira Knightley and her husband, James Righton. After chatting with their pals, the pair went back inside hand-in-hand. That's when things got a little hot and heavy!

Adam took Behati into the corner, the eyewitness tells E! News, and she put her hands around him as they embraced in a little makeout session. (Hey, why not, right?)

"I didn't suck, that's the only thing I'd like to say," Levine, who made his acting debut in the film, told E! News on the carpet. "I didn't suck and that's all I needed, was to not suck. So mission accomplished. It's such a great movie though, so I'm kind of just proud of it regardless of what the outcome is, what people thought of my own performance…I just thought it was something that was really great to be a part of. I was fortunately right and I think it's fantastic."

The singer was joined by his model love on the carpet for the premiere, and the two absolutely glowed together—which makes sense considering they're going to be swapping vows in just a few weeks!

When asked whether or not Levine was going to serenade his blushing bride during at the ceremony, he told us, "I don't know. Maybe!" (For what it's worth, Adam, you totally should. Trust.)

Levine and Prinsloo are set to wed in an intimate ceremony in Mexico on July 19.

The wedding will take place at the luxe Hotel El Ganzo in Los Cabos. The attractive couple will host a rehearsal dinner the night before they exchange their vows and guests will also attend a brunch the day after the wedding, before the newlyweds depart for their honeymoon.

—Reporting by Jennifer Cooper