2.In honor of her little sister Jamie Lynn Spears' 30th birthday, Britney Spears posted this photo of the two of them in the early '00s:
3.Nicole Kidman celebrated the release of Taylor Swift's Fearless (Taylor's Version) by sharing this photo of herself, Taylor, and Keith Urban at the Academy of Country Music Awards in 2009:
4.Betty White celebrated National Pet Day by posting this photo of herself alongside her pupper friends in the 1950s:
5.In honor of his 25th anniversary, Hugh Jackman shared these photos of himself and Deborra-Lee Furness on their wedding day in 1996:
6.Jon Bon Jovi posted this video clip of himself and his cousin in the mid-'60s:
7.Kandy Muse shared this cute photo of herself from the late-'90s that was shared on last week's episode of RuPaul's Drag Race:
8.Janet Jackson shared this photo of herself with her longtime BFF Paula Abdul:
9.Gwen Stefani celebrated the 25th anniversary of her and No Doubt's hit single "Don't Speak":
10.Missy Elliott retweeted this photo of herself from 2005:
11.Elizabeth Banks celebrated Seth Rogen's 39th birthday by posting this photo of the two of them on the set of their 2008 film, Zack and Miri Make a Porno:
12.Salma Hayek shared this glam photo of herself at the LACMA 2013 Art + Film Gala:
13.Jackée Harry remembered when she, Alan Alda, Loni Anderson, and Burt Reynolds were on a celebrity edition of Win Lose or Draw in the '80s:
14.Kim Kardashian posted this pic of herself in 2006:
15.And finally, Gabrielle Union-Wade paid tribute to her longtime friend DMX — who died last week at age 50 — by sharing this photo of the two of them from their 2003 film Cradle 2 the Grave, and she wrote a heartfelt caption to him: