Kunis, 24, and the 'Two and a Half Men' star were spotted strolling through London with her parents, Elvira and Mark, and then spent the evening watching 'Billy Elliot: The Musical' at a theatre, reported Contactmusic.
Kutcher is also said to have made breakfast for the entire Kunis' family. "Ashton thought it would be nice to lay on a good old English fry-up. It was knocked up in one pan," a source said.
Kunis is currently busy shooting for her upcoming movie 'Jupiter Ascending' in the city and the couple have been staying in Hampstead, north London, which is near the shooting location. Kutcher started dating his former 'That '70s Show' co-star a few months after he split from wife Demi Moore in November , 2011.