But who is the fitness model and where is the aspiring actor from?
Here all you need to know about Britney's new man...
And it's not the first music video Sam has starred in.
In November 2016 Sam posted a laid back snap of the couple enjoying a sushi date on his Instagram page with Britney poking her tongue out.
Britney has been marred twice before – once for just 55 hours to Jason Allen Alexander and a second time to dancer Kevin Ferderline, with whom she has her sons Sean Preston, 12, and Jayden, 11.
Also her first album ever to yield three top ten hits in the US, including commercially successful singles like "Till the World Ends" and "I Wanna Go".
Spears's eighth studio album, Britney Jean, was released in 2013.
It marks Spears' first major activity under RCA Records since the dissolution of her long-time record label, Jive Records, in 2011.
The singer's third compilation album, The Singles Collection, featured her third number one single in America, "3".
In 2011, she released the song "Hold It Against Me", which made Spears the second artist in the Billboard Hot 100's 52-year history to debut at number one with two or more songs, just behind American recording artist Mariah Carey.
Britney sparked rumours she could be engaged to Sam after she was spotted with a ring on her left hand.