Mila Kunis and her Jupiter Ascending costar Channing Tatum had a night out in London yesterday with their significant others. She brought along boyfriend Ashton Kutcher, while Channing had the company of his pregnant wife, Jenna Dewan. The foursome were reportedly able to attend the premiere of the English National Opera's Sunken Garden at the Barbican Center. The evening of opera was a bit of a change from the sci-fi material Mila and Channing have been busy with. Work on Jupiter Ascending has both Channing and Mila hunkering down in the English capital for a good period of time. Mila's apparently staying in the city itself, while Channing and Jenna are enjoying the last weeks of her pregnancy at Sienna Miller's house outside of London in the Cotswolds.