The couple has reunited after ending their two year relationship in January and confirmed their reconciliation when they arrived arm-in-arm for the Aug 17 bash, reports femalefirst.co.uk.
"They started the shoot in April as just friends and then one day they started kissing. One thing led to another and they hooked up. All her old feelings came rushing back. Jennifer has been telling people she's in love again," said a source.
Mumbai Roundup: 9 incidents that took place this week
Photos: Ajay Devgn, Parineeti, Tabu at 'Golmaal Again' trailer launch
Photos: Dipika Pallikal Karthik oozes oomph in bikinis and sarees
Photos: Kareena Kapoor Khan's grand birthday bash
Photos: 'Dangal' girls Sanya Malhotra, Fatima Sana Shaikh's dinner outing