Couple split earlier this year
The couple – who split in January after two years together – are filming X-Men: Days Of Future Past together
and sources say they’ve grown close whilst making the movie.
‘They started the shoot in April as friends, and then one day they just started kissing,’ a source tells Us Weekly.
‘One thing led to another and they hooked up. All her old feelings came rushing back. Now they’re fully back on.’
Jen, 22, and Nicholas, 23, are said to be ‘inseparable’ now they’ve reunited and ‘always eat lunch together’ on location in Montreal, Canada.
They were spotted enjoying a walk with Jen’s family earlier this month and on 13 July were seen browsing in a music store.
‘Jennifer has been telling people that she’s in love again!’ the source says.
Before their break-up Oscar-winning Jen admitted that British actor Nicholas was her closest pal.
‘My boyfriend is honestly my best friend, and hopefully I’m his best friend too,’ Jen told Elle Magazine last year.
‘He’s my favourite person to be around and he makes me laugh harder than anybody.’