1. You're used to seeing Freddie Prinze Jr. with Sarah Michelle Gellar, but before SMG, Freddie was with Kimberly McCullough: Ron Galella Ltd. / Ron Galella Collection via Getty Images
2. And before Freddie Prinze Jr., Sarah Michelle Gellar was with Jerry O'Connell: Ron Galella Ltd. / Ron Galella Collection via Getty Images
3. You're used to seeing Blake Lively with Ryan Reynolds, but before Ryan, Blake was with Kelly Blatz: Gregg Deguire / WireImage / Getty Images
4. And before Blake Lively, Ryan Reynolds was with Alanis Morissette: Steve Granitz / WireImage / Getty Images
5. You're used to seeing Meghan Markle with Prince Harry, but before Prince Harry, Meghan was with Trevor Engelson: Amanda Edwards / Getty Images
6. And before Meghan Markle, Prince Harry was with Chelsy Davy: Max Mumby / Getty Images
7. You're used to seeing Tom Hanks with Rita Wilson, but before Rita, Tom was with Samantha Lewes: Bei / Bei/Shutterstock
8. And you're used to seeing Neil Patrick Harris with David Burtka, but before David, Neil was with Carla Bianco: New York Daily News Archive / NY Daily News via Getty Images
9. You're used to seeing Dax Shepard with Kristen Bell, but before Kristen, Dax was with Kate Hudson: Fafl / FameFlynet / Backgrid
10. And before Dax Shepard, Kristen Bell was with Kevin Mann: Mychal Watts / Getty Images
11. You're used to seeing John Krasinski with Emily Blunt, but before Emily, John was with Renée Zellweger: Donato Sardella / WireImage / Getty Images
12. And before John Krasinski, Emily Blunt was with Michael Bublé: Patrick McMullan / Patrick McMullan via Getty Images
13. You're used to seeing Sophie Turner with Joe Jonas, but before Joe, Sophie was with James Brittain-McVey: 14. And before Sophie Turner, Joe Jonas was with Gigi Hadid: Demis Maryannakis / GC Images / Getty Images
15. You're used to seeing Priyanka Chopra with Nick Jonas, but before Nick, she was with Harman Baweja: Str / AFP via Getty Images
16. And before Priyanka Chopra, Nick Jonas was with Miley Cyrus: Rob Hoffman / Getty Images
17. You're used to seeing Jada Pinkett Smith with Will Smith, but before Will, Jada was (reportedly) with Tupac Shakur: Gene Shaw / Getty Images
18. And before Jada Pinkett Smith, Will Smith was with Sheree Zampino: Ron Galella Ltd. / Ron Galella Collection via Getty Images
19. You're used to seeing Lance Bass with Michael Turchin, but before Michael, Lance was with Reichen Lehmkuhl: Patrick McMullan / Patrick McMullan via Getty Images
20. And you're used to seeing Isla Fisher with Sacha Baron Cohen, but before Sacha, Isla dated Darren Day: Michael Crabtree — PA Images / PA Images via Getty Images
21. You're used to seeing Ryan Gosling with Eva Mendes, but before Eva, Ryan was with Olivia Wilde: NBC / NBCUniversal via Getty Images
22. And before Ryan, Eva was with George Gargurevich: J. Countess / Getty Images
23. You're used to seeing Nicole Kidman with Keith Urban, but before Keith, Nicole was with Lenny Kravitz: New York Daily News Archive / NY Daily News via Getty Images
24. And you're used to seeing Tim McGraw with Faith Hill, but before Faith, Tim was with Kristine Donahue: Frank Micelotta Archive / Getty Images
25. You're used to seeing Ted Danson and Mary Steenburgen together, but before Mary, Ted dated Whoopi Goldberg: Mitchell Gerber / Corbis/VCG via Getty Images
26. And before Ted Danson, Mary Steenburgen was with Malcolm McDowell: Images Press / Getty Images
27. You're used to seeing Ellen DeGeneres and Portia de Rossi together, but before Ellen, Portia was dating Francesca Gregorini: Amy Graves / WireImage / Getty Images
28. And before Portia di Rossi, Ellen DeGeneres was with Alexandra Hedison: Wwd / Penske Media via Getty Images
29. You're used to seeing Matthew Broderick with Sarah Jessica Parker, but before SJP, he was with Daisy Foote: Ron Galella Ltd. / Ron Galella Collection via Getty Images
30. And before Matthew Broderick, Sarah Jessica Parker was with Robert Downey Jr.: Barry King / Getty Images
31. You're used to seeing Kurt Russell with Goldie Hawn, but before Goldie, he was with Season Hubley: Walt Disney Television Photo Arc / ABC
32. And before Kurt Russell, Goldie Hawn was with Bill Hudson: Richard E. Aaron / Redferns / Getty Images
33. You're used to seeing Gabrielle Union and Dwyane Wade together, but before Gabrielle, Dwyane was with Siohvaughn Funches: Jon Kopaloff / FilmMagic / Getty Images
34. And before Dwyane Wade, Gabrielle Union was with Chris Howard: Chris Farina / Corbis via Getty Images
35. You're used to seeing Hailey Bieber with Justin Bieber, but before Justin, Hailey was with Shawn Mendes: Theo Wargo / Getty Images for Huffington Post
36. You're used to seeing Serena Williams with Alexis Ohanian, but before Alexis, Serena was with Brett Ratner: Ian West — Pa Images / PA Images via Getty Images
37. And before Serena Williams, Alexis Ohanian was with Sabriya Stukes: Bryan Bedder / Getty Images
38. You're used to seeing Kelly Ripa with Mark Consuelos, but before Mark, Kelly dated Vincent Young: Ron Galella / Ron Galella Collection via Getty Images
39. And you're used to seeing Heidi Montag with Spencer Pratt, but before Spencer, Heidi dated Jordan Eubanks: Patrick McMullan / Patrick McMullan via Getty Images
40. You're used to seeing Joel Madden with Nicole Richie, but before Nicole, Joel was with Hilary Duff: Jeff Kravitz / FilmMagic Inc. / Getty Images
41. And before Joel Madden, Nicole Richie was with DJ AM: J. Vespa / Getty Images
42. You're used to seeing Kevin Bacon with Kyra Sedgwick, but before Kyra, Kevin was with Tracy Pollan: Ron Galella Ltd. / Ron Galella Collection via Getty Images
43. And you're used to seeing Elton John with David Furnish, but before David, Elton was with Renate Blauel: Mirrorpix / Getty Images
44. You're used to seeing Enrique Iglesias with Anna Kournikova, but before Anna, Enrique dated Jennifer Love Hewitt: Toni Anne Barson Archive / WireImage / Getty Images
45. And before Enrique Iglesias, Anna Kournikova was married to Sergei Fedorov: Clive Brunskill / Getty Images
46. You're used to seeing Harrison Ford with Calista Flockhart, but before Calista, Harrison was with Melissa Mathison: Jean-louis Urli / Gamma-Rapho via Getty Images
47. And before Harrison Ford, Calista Flockhart was with Robert Downey Jr.: Frank Trapper / Corbis via Getty Images
48. And lastly, you're used to seeing John Legend with Chrissy Teigen, but before Chrissy, John was with Danielle Abreu: Patrick McMullan / Patrick McMullan via Getty Images
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