The American actress and her 'X Men' co-star have reportedly bought a house in St John's Wood in north London and will be making their own furniture after purchasing it from flat-pack store Ikea.
According to The Sun newspaper, his sister, Clarista Hoult, said: "It's his first house. He's very excited and has been getting all his furniture from Ikea.
"Nick has been big into feng shui, so in his room he has had branches, twigs with lights, the mattress and everything else on the floor - like water features and chairs - facing in the right direction."
Jennifer, 23, first met Nicholas, 24, on the set of 2011's 'X-Men: First Class' but they later split in January 2013, before getting back together that summer to film the new 'X-Men' movie.
The pair have spent several weeks looking for their perfect home and previously fell in love with a £1.3million home in Hook, a village in Hampshire close to where Nicholas's family live.
An insider previously said: "Jen loves the English way of life and as they are now serious again, it makes sense to look into buying somewhere."
Meanwhile, the couple were seen last week at a friend's house party in Dulwich, south London, as they spend more time together in the capital.
The pair went incognito to try and avoid the paparazzi wearing casual clothing for the low-key evening.