Olympic diver Tom and the Hollywood screenwriter, who goes by his middle name Lance, were snapped leaving the Riverside Studios in London on Tuesday evening (1 April).
LA-based writer/director Lance jetted into the UK last week, after Tom returned to London following the Dubai leg of the FINA Diving World Series.
At the weekend, they were seen with Tom's mum and brothers at a performance of Charlie and the Chocolate Factory in the West End, a family outing to celebrate Tom's mum's birthday (and presumably an early Mother's Day treat!)
Tom, 19, and Lance, 39, began dating last year but have generally kept their relationship away from the cameras, only confirming their romance in January with a cute selfie of them together at a London restaurant.
Lance was a frequent visitor to the Splash! set earlier this year, where Tom was the celebrity diving coach for a second year running.
And he's back in the UK just in time to support Tom's latest TV venture, Tom Daley Goes Global, which kicks off on Thursday, 10 April on ITV2. The documentary series will follow Tom and his childhood best friend Sophie Lee as they backpack around several countries, starting with Thailand.
Back in December, Tom spoke about his then-unnamed boyfriend during a TV chat, saying: "He makes me feel safe and happy, right now I couldn't be happier."
He added: "I'd never felt the feeling of love, it happened so quickly, I was completely overwhelmed by it to the point I can't get him out of my head all the time. I've never had it before where I love someone and they love me just as much."
Meanwhile, you can watch Tom on this week's episode of Celebrity Juice, where he's a guest alongside X Factor winner Sam Bailey and TV presenter Alex Brooker.
Pictures of Tom on his Thailand backpacking adventure below:
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