JT - keep your trousersnake in your pants!

Not our words, but those of his girlfriend Jessica Biel, who has warned her beau Justin Timberlake not to mess her about, cheat on her - or expect her to get down and dirty with him at a wild Hollywood party.

That's right, Jess is all for clean living and hottie Justin has better watch his step or she won't stick around for long!

She said: "I take relationships very seriously because I've had so few. I'm a real romantic. I've always steered clear of the party and dating scene," Now magazine reports.

"So if there was a huge drug-fest happening and everyone was getting it on in the bedroom, I'd always leave. It's easy to buy into all that flash stuff when you're working in fantastic places with great-looking people.

"You could easily lose your brain, put aside all your morals and dedicate yourself to a whirlwind of parties and everything that goes with it. There are so many temptations - but that's not for me."

Jess has been dating Justin since January this year - so he must be doing something right?!

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