Britney Spears Does Backflips To Justin Timberlake Song

It's Flipney, b*tch.

eFans were gifted with a big ol' dose of nostalgia on Saturday when Britney Spears uploaded a video to Instagram training with her gymnastics coach while listening to a Justin Timberlake track.

Sharing the vid with her 21.3 million followers, Brit is seen in her backyard, nailing several back handsprings while the "I Think She Knows" interlude from her ex-boyfriend's tune "LoveStoned" plays -- and fans were positively SHOOK.

"Nothing like flips and Mother Nature!!!" Spears wrote.

It came as a welcome surprise to fans, as Britney and Justin were probably the most iconic musical pairings of the late '90s/early 2000s, dating for three years between 1999 and 2002.

They also gave us the gift that will forever keep on giving, in the form of this iconic photograph taken at the 2001 American Music Awards as the pair -- who were both just 19 at the time -- strolled the red carpet in matching denim outfits (can you believe this was 17 years ago, WTF?!).

READ MORE: Britney Spears And Kevin Federline Settle Child Support Dispute

It's called fashion sweetie, look it up. Image: Getty

Fans of the 36-year-old were quick to lose their sh*t over Brit's v. specific choice of song, and immediately made it known across social media.

"Okey this is the best since 1999. Britney flipping to a Justin Timberlake song is my dream come true🔥" one fan commented, while another wrote, "um did you notice JUSTIN TIMBERLAKE playing in the background. Brit n just 4 eva."

READ MORE: Everyone's Screaming At Britney's Las Vegas 'Announcement'

While the pair seemed to have a messy break-up back in the day -- with JT releasing alleged revenge track 'Cry Me A River' shortly after their split -- it all seems to be water under the bridge for the duo, with Brit revealing in 2016 that she would love to collaborate with her former flame.

Justin later said he would "absolutely" be down with that -- however, there's no update on whether such a collaboration will actually happen (fingers crossed it does 'cos that would be a certified BOP).

Meanwhile, Brit has also revealed that she will soon be returning to Las Vegas for a new residency called Britney: Domination, which is set to begin in February, at the Park Theater in the Park MGM Hotel and Casino.

Image: Getty