Justin Theroux and Jennifer Aniston: Major PDA, Sexual Tension Alert!

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When Robert Pattinson and Kristen Stewart made their entrance at an MTV Movie Awards after-party Sunday, they were followed by another low-key couple:

Jennifer Aniston and Justin Theroux!

After weeks of keeping their romance under wraps, the former Wanderlust co-stars finally went public - in a big, affectionate, sexual tension filled way!

Chatting with director Brett Ratner, Aniston and Theroux were unabashed with each other. She adjusted his tie, and he gave her a sweet kiss, Us says.

Jen A. Cleavage

She smiled ear-to-ear and leaned into her man, who rubbed her neck. HOT. As they greeted other celebs, the duo remained at one another's side.

While Jennifer Aniston chatted animatedly with other guests, Justin Theroux looked on adoringly, and they exchanged kisses throughout the night.

When it was time to leave, Theroux grabbed her booty and stole another kiss!! "Lots of sexual tension," one witness says of the new lovebirds.

Hard to blame the guy for being excited, dating the hottest woman of the decade and all. Adds the source, "She [has] never seemed happier."

[Photos: WENN.com / Fame]

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Jennifer Aniston is beloved throughout Hollywood. She's had a tough personal life, but is still beautiful and a solid actress. More »
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Jennifer Aniston

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I actually feel I've been unbelievably lucky in love. I don't feel like I'm supposed to be any further along or somewhere that I'm not. I'm right where I'm supposed to be.

Jennifer Aniston

You just have to love your life. I have my health, I have my friends, I have my loved ones. I'm extremely lucky.

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