The Britney Spears-Paris Hilton love fest is still going strong. “Extra” spotted Brit getting some sleep Monday morning in the front seat of Paris’ car.

By Monday night, Britney and Paris were back on the Hollywood scene, arriving at the nightclub Hyde.

Paris made it to the club first and then waited at the entrance for her new gal pal.

Insiders say Paris has been giving an insecure and newly single Britney fashion tips and has even helped out with the babysitting duties. Monday night, despite the crush of paparazzi, Paris was able to guide Spears inside the club, where sources say they were inseparable.

Rumors are also swirling that Paris and Brit may be taking their relationship to the next level. So could a professional partnership be next for these BFFs?

“Sources tell us that they’re specifically talking about recording a duet,” revealed Us Weekly’s Katrina Szish.

Brit and Paris will get the chance to feel each other out professionally for the first time next Monday when they co-host the Billboard Awards in Las Vegas, and Szish adds that their chemistry together should be no problem!

“Britney’s very powerful. She has a lot of money, she’s very attractive; the same goes for Paris,” she insisted. “So they really have no issues of jealousy.”

As for the club scene, Britney left without Paris last night under her coat. The paparazzi gave chase, but cops were in hot pursuit too. Britney finally descended on (you guessed it) Paris’ pad.