They grow up so fast!
From the Kardashians and Jenners to the Olsen twins, there are plenty of famous siblings who’ve grown up right before our eyes!
RELATED: 12 Photos of Celeb Kids Acting Like Regular Kids
RELATED: 12 Celebrities You Had NO Idea Were Twins
Click through the gallery to see then-and-now photos of celebrity sisters and brothers that will make you feel old.

BOGO Never Felt So Good
Whether you're looking to sleep better, have less anxiety, get pain relief or simply unwind the mind, these award-winning CBD Gummies from Sky Wellness do just the trick! Available in a variety of flavors, don't miss this special BOGO offer. Learn more at SkyWellness.com.
-
Demi Lovato Madison De La Garza
Getty Images, Instagram Demi Lovato and Madison De La Garza Demi's little sister is now 16 years old, while the singer is 25. -
-
Justin Bieber Jaxon Bieber
Getty Images Justin and Jaxon Bieber Justin's little brother is now eight years old, while the singer is 23. -
Paris And Nicky Hilton
Getty Images Nicky and Paris Hilton Paris is now 36 and her little sis is 34. -
Olsen Sisters
Getty Images Mary-Kate, Ashley, and Elizabeth Olsen Mary-Kate and Ashley are 31 years old, and their baby sis is 28. -
James Franco Dave Franco
Getty Images James and Dave Franco James is 39, and his little bro is 32. -
Elle Fanning Dakota Fanning
Getty Images Dakota and Elle Fanning Dakota is 23, while her little sister is now 19 years old. -
Britney Spears Jamie Lynn Spears
Getty Images, Instagram Britney and Jamie Lynn Spears Britney's younger sister is 26 years old, while the pop star is 36. -
Jaden And Willow Smith
Getty Images Jaden and Willow Smith Jaden is 19, while his sister is 17. -
Kendall And Kylie Jenner
Getty Images Kendall and Kylie Jenner Kendall is 22 and her sister is 20. -
Ashlee Simpson Jessica Simpson
Getty Images Jessica and Ashlee Simpson Jessica's little sister is 33 years old, while the singer is 37. -
Chris Hemsworth Liam Hemsworth
Getty Images Chris and Liam Hemsworth Chris is 34 and his younger brother is 27. -
Beyonce And Solange Knowles
Getty Images Beyoncé and Solange Knowles Bey's younger sister is 31 years old, while the pop star is 36. -
Hilary And Haylie Duff
Getty Images Haylie and Hilary Duff Hilary's big sis is 32, while the actress is 30. -
Julianne Hough Derek Hough
Getty Images Derek and Julianne Hough Derek is 32 and his sister is 29. -
Kardashian Sisters
Getty Images Kourtney, Kim, and Khloé Kardashian Kourtney, Kim, and Khloé are 38, 37, and 33 respectively. -
Vanessa Hudgens Stella Hudgens
Getty Images Vanessa and Stella Hudgens Vanessa's little sis is 22 years old, while the High School Musical actress is 29. -
Luke And Owen Wilson
Getty Images Owen and Luke Wilson Owen is 49 and his brother is 46. -
Tia And Tamera Mowry
Getty Images Tia and Tamera Mowry The twins are 39 years old. -
Maggie And Jake Gyllenhaal
Getty Images Maggie and Jake Gyllenhaal Jake is 37 while his big sis is 40. -
Miley Cyrus Noah Cyrus
Getty Images, Instagram Miley and Noah Cyrus Miley is 25 and her little sis is 17. -
Ali Lindsay Lohan
Getty Images Lindsay and Ali Lohan Lindsay is 31, and baby sis Ali is 24. -
Jonas Brothers
Getty Images, Instagram Kevin, Joe and Nick Jonas Now a father of two, Kevin is 30. Joe is 28, and Nick is 25. FYI, the "bonus Jonas," baby brother Frankie, is 17! -
Jack Kelly Osbourne
Getty Images Kelly and Jack Osbourne. Kelly is 33, and her brother is now 32 — and a dad to two daughters. -
Nicole Sofia Richie Now Then
Getty Images Nicole and Sofia Richie Big sis Nicole is 36, while her younger sister Sofia is 19. -
Taylor Austin Swift
Getty Images Taylor and Austin Swift Taylor's 28, and her younger brother, Austin, is 25.