The album held a 15-year-record for the biggest U.S. sales week ever for a female artist and sold over 1,319,000 copies in the first week alone. The only album to beat the figure since is Adele's 2015 album "25".
Taking to Instagram, Britney posted a video of its title track along with various promotional interviews she did when releasing the album.
"Thank you to whoever made this ..... I just nearly dropped my phone I wasn't expecting it," she wrote in a caption, suggesting the clips were put together by a fan. "20 years since the Oops! album ... the anticipation and the butterflies I felt before it came out were crazy ... all of my expectations were exceeded!!!!"
The "Stronger" hitmaker added, "And it's all thanks to you folks .... thank you for sticking with me and growing with me ... I am one Lucky girl. God Bless and thank you all !!!!!! PS you see even 20 years ago I still liked to twirl!!!!"
In March, the singer also marked the anniversary of the record's title track, gushing, "Oops!....how did 20 years go by so fast?!??! I can't believe it."
"I remember that red suit was so freaking hot ...but the dance was fun and it made the shoot fly by !!!!!"