Put a ring on it! Justin Timberlake and Jimmy Fallon perform Beyonce's Single Ladies dance at the U.S. Open tennis tournament
If the tennis matches were not enough entertainment at the U.S. Open tournament, Justin Timberlake and Jimmy Fallon were happy to add some more.
The 34-year-old singer and the 40-year-old late-night host were sitting together at the Queens, New York event on Wednesday when they decided to dance.
It was not just any dance - their moves carefully mimicked those performed in Beyonce's famous Single Ladies video.
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Dancing fools: Jimmy Fallon (left) and Justin Timberlake (right) danced during the U.S. Open in Queens, New York on Wednesday
Familiar: Their moves were taken from Beyonce's 2008 hit, Single Ladies
France's Richard Gasquet and Switzerland's Roger Federer were battling it out during the Men's Singles Quarterfinals match at the time, but Justin and Jimmy seemed more intent on dancing.
There were plenty of differences, of course, between the men's moves and those performed in the famous 2008 video.
For one thing, neither Jimmy nor Justin wore a leotard to watch tennis - they were instead both wearing button-down shirts under light jackets.
Copycats: The two men clearly knew what they were doing, imitating several iconic moves from the video
Backwards: A small but notable difference was in orientation - the men performed many moves in the opposite direction from Beyonce's original
Different costumes: As they were at a tennis match, Justin and Jimmy wore button-down shirts with jackets and trousers
Iconic: The original video - which netted Beyonce three MTV Video Music Awards in 2009 - had a famous look, including minimalist costumes of leotards and shoes
Justin also added a black fedora, while Jimmy's only notable accessory was the splint on his hurt finger.
Beyonce, 34, and her dancers famously wore black leotards and high heels for the black-and-white video.
Interestingly, another difference was in the orientation of the dancers, since Justin and Jimmy held up their right hands while dancing.
No rings: In addition to the men offering the wrong hands to 'put a ring on it,' Jimmy's injured left ring finger would have not worked at all
Forget sports: The dancing antics came during a Men's Quarterfinals match between Richard Gasquet and Roger Federer
As Beyonce exhorted men to 'put a ring on it' in the song, she and her dancers brandished their left hands, the appropriate location for an engagement or wedding ring.
The men continued their opposite stance when crouched over for another part of the dance, facing left when Beyonce and her dancers faced right.
While Jimmy might be forgiven for mixing up some of his Single Ladies moves, Justin has performed the dance before - with Beyonce herself.
Past experience: Justin had performed the Single Ladies dance at least once before - with Beyonce herself
Parody: The comedic version of the video came during a 2008 episode of Saturday Night Live
Not quite the same: Instead of her professional women, Beyonce had three silly men as backup dancers
On the November 15, 2008 episode of Saturday Night Live, Justin and Beyonce were the host and musical guest, respectively, and got together for a series of short skits.
The Single Ladies setup was reproduced in them - black-and-white footage, leotards, and heels - but Beyonce was backed up by three men.
Justin, along with comedians Andy Samberg and Horatio Sanz, proceeded to make a mess of most of Beyonce's moves in several takes.
Success: In addition to the video winning awards, Single Ladies was a number-one hit and was certified platinum four times over
Not so smooth: They tried, but Jimmy and Justin did not do quite so good a job as Beyonce
One of the most famous videos of all time, Beyonce's Single Ladies won three MTV Video Music Awards in 2009 and the song was certified platinum multiple times.
It was also the music video at the centre of Kanye West's infamous 'I'mma let you finish' moment, when he took away the microphone from Taylor Swift after she won Best Female Video instead of Beyonce.
Relaxing: When done, the two celebrities - apparently good friends - sat down to have a laugh
Meanwhile: Richard Gasquet (above) was playing Roger Federer in the Men's Quarterfinals during the dancing
Champion: Roger (above) was the higher-seeded player and eventually won the match
Famous faces: Other celebrities watching the match included Alec Baldwin (left) and Andre Agassi (right)
Famous friends: After the game, JT stopped to chat to actor Alec
We three: Jimmy wrapped an arm around Alec as they were entertained by JT
Looking slick: The new father look stylish in a green jacket and white chino trousers
Smile! One chancer decided to take the opportunity of a selfie with JT
Obliging: The musician was grateful of the fuss and smiled while they snapped him
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