The `Edge of Glory` singer announced she had separated from Luc Carl in May but the pair have now decided to give their romance another try.
A source told Us Weekly magazine: "They had a little fight. I think the break-up lasted a week or two. But they are totally backtogether now."
Gaga - who got togetherwith Luc again in July 2010 after they had a break from each other - announced she was single during an appearance on British TV series `The Graham Norton Show`.
She said: "No, I don`t have a boyfriend and haven`t been on any dates recently."
The 25-year-old singer wrote the song `You and I`, which features on her global chart-topping album `Born This Way`, about 30-year-old Luc and admitted in the wake of the break-up performing the track makes her emotional.
She explained: "There is not one song on any of my records that wasn`t written by me, and I think when you write your own music you find ways to reinvent [the songs] emotionally through yourself and performance so that they are different every night and that song you know, sometimes it`s about the guy and sometimes it`s about the fans."