Sporting almost identical outfits, the pair couldn't have looked happier as they walked the red carpet at the Battersea Power Station Summer Party on Wednesday evening (30 April).
We do reckon they look rather like twins in those denim and leather combos. Maybe it's true that couples do start morphing into each other eventually?!
Olympic diver Tom, 19, and his Oscar-winning screenwriter partner, 39, met at the Kids' Choice Awards in Los Angeles last year, but kept their romance under wraps for several months.
Following weeks of speculation, teenager Tom confirmed their relationship in January 2014, by tweeting a picture of them together at dinner.
Since then, Lance has spent plenty of time in the UK, supporting Tom during the filming of ITV diving show Splash! and most recently cheering him on at the FINA/NVC World Series Diving event in London at the weekend.
Tom finished fifth in his 10m platform final after suffering a bout of nerves on his second dive, which he describes as "terrifying".
Afterwards, his boyfriend showed his support by tweeting: "Proud of you @TomDaley1994 Can't wait to cheer you on all over again in Canada."
Yesterday's event was the inaugural Battersea Power Station party and Sir Elton John was on hand to serande the guests with a special concert. Tom Odell also performed. It was held to thank everyone that has made the Battersea development come together and bring together people from across the community.
Last night, the guys were joined by Tom's best friend Sophie Lee, who stars alongside him on the ITV2 show Tom Daley Goes Global.
The series follows Tom and Sophie as they embark on a whirlwind backpacking experience across the world. So far, we've seen them tackling rainforests and monsoons in Thailand, teeny tiny hostel rooms and karaoke in Japan and the freezing cold (and beauty) of New Zealand.
Tom Daley Goes Global continues tonight at 9pm on ITV with Tom and Sophie travelling to Australia.
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Check out pictures from Tom and Sophie's travels to New Zealand below:
Copyright: ITV/TwoFour Production