DemiLovatoTimbaland072911.jpgTwitter

MissyElliotDemiLovato072911.jpgNow this is how you make a comeback!

Hot on the heels of her successful first-post rehab single, "Skyscraper," Demi Lovato hit the studio for some late nights with Timbaland and Missy Elliot.

The former Sonny with a Chance star is working with Timbaland on her as-yet-untitled third album, dropping September 20, and the Grammy winning producer is just as excited as Demi. Along with the cute pic above, Tim Tweeted, "Me and Demi @ddlovato workin on a hit baby!"

During a Cambio live chat last week, Demi told fans that she's already recorded about 20 songs. "I'm feeling really, really comfortable on what we have so far," she said. Timbaland agrees - he's Tweeted that Demi's been killing the songs he's giving her.

We're not sure if the sepia-toned pics are helping them churn out the hits, but Demi's clearly doing something right working with Missy too. “4 am: @MissyElliott and demi lovato @ddlovato working hard in the studio! #demiandmissy,” Timbaland Tweeted.

Timbaland has wanted to work with Demi for months now - which is high praise in itself. See what he had to say about the singer ... after the jump.