The former couple, who first met on set of X-Men: First Class in 2010 and split in January of this year, are currently working on the latest X-Men movie together.
Jen and Nicholas have been spotted hanging out and spending quality time with Jen's family off set. And now, UsWeekly reports that the twosome is totally back together!
"They started the shoot in April as friends, and then one day they just started kissing," a source tells the mag. "One thing led to another and they hooked up. All her old feelings came rushing back. Now they're fully back on."
The kissing costars, who play love interests in the movie, were spotted shopping at an HMV record store on July 13 in Montreal and reportedly, the Hunger Games star is smitten.
"Jennifer's been telling people that she's in love again!" UsWeekly reports.
Wow! Do you think they'll stay together this time?