The Just Dance singer - who was in London last week to support the Pussycat Dolls on tour and promote her album The Fame - spent some time in the studio with Ronson - who has masterminded hits for Amy Winehouse, Lily Allen and the Kaiser Chiefs.
A source said: "They worked on a couple of tracks which have a vintage feel." The 22-year-old former burlesque dancer has also revealed she is launching her own fashion range to help youngsters recreate her daring outfits.
Lady GaGa - who repeatedly braved the cold UK temperatures in a variety of skimpy outfits, including a PVC corset and hotpants - said: "I can't wait to do my own line. It's definitely something I want to do in the next year as I do have my own style. I'm already talking to my boy Akon about it."
Singer-and-producer Akon recently defended the singer's flesh-flashing outfits. He said: "People dissed her because of the way she dresses, but she's hot. Everyone wants to look like her. "She'll walk around in London in her underwear and you watch, everyone will catch on."