Justin Bieber planted an open-mouth kiss on a mannequin  on his appearance on "Late Night With Jimmy Fallon." The 18 year-old had a steamy make-out session on Tuesday, Feb. 5 that left fans expressing their jealousy on Twitter.

"I'm still staring at the video of Justin french kissing that mannequin. dont judge," one fan posted on Twitter.

"Justin showed soo much passion into kissing that mannequin it was sexyy! Wanna try that with me?" another fan posted.

Justin Bieber and Jimmy Fallon played a game that involved throwing "random" into a basketball hoop. When Bieber picked up the mannequin, he felt an earnest desire to kiss the plastic head.

"Don't fall in love with it, Justin, no!" Fallon said, before Bieber tossed the head through the hoops.

[Watch Bieber on "Late Night With Jimmy Fallon"]

Bieber will remain in New York City this week for his stint on SNL. The "Boyfriend" singer will be hosting the NBC comedy skit show on Feb. 9.

"I'm nervous, but I think it's going to be fun. I've just got to remember to memorize the lines," Bieber said in his interview with Fallon. The star also when on to talk about his most recent release--"Believe Acoustic." Bieber re-released his successful "Believe" album in a special "stripped" version.

"I wanted to basically strip it down so it's just me and an acoustic guitar," Bieber said to on "Late Night" on Tuesday. "Some of it is me and a piano but most of it is just raw me. I think the fans really like it because its just kind of how I started. I started with just me on the internet. Not really with all the produced pop music and so it's just that it's just really mellowed down and I feel like it's made for all ages."

"It's just good music," the "Boyfriend" singer added. "It just shows that I wasn't made, I was found on YouTube and it shows people music is music. That's what you need to focus on -- listening to the music. I'm an artist. I'm not - I'm a singer and I want to show people what I love to do."

Bieber's "Believe Acoustic" is in stores now.

[Catch Bieber's SNL Promo]