1. Downton Abbey star Michelle Dockery just became Fleabag creator/star Phoebe Waller-Bridge's sister-in-law.
On Saturday (Sept. 23), Michelle tied the knot with Phoebe's brother Jasper Waller-Bridge at St Nicholas' Church in London.
2. Jake Gyllenhaal's brother-in-law is Peter Sarsgaard.
Jake's sister Maggie Gyllenhaal is married to Peter. Maggie and Peter have been married since 2009 and they share a 16-year-old daughter named Ramona.
3. Nicole and Sofia Richie gained a sister-in-law in Cameron Diaz.
Cameron married Good Charlotte member, Benji Madden, in 2015, while Nicole married Benji's twin brother, Joel Madden, in 2010.
4. Scandal's Scott Foley is Patrick Wilson's brother-in-law.
The Insidious star is married to actor/writer Dagmara Domińczyk and Scott is married to her sister, actor Marika Domińczyk.
5. Ashlee Simpson's mother-in-law is legendary singer Diana Ross.
Ashlee is married to Diana's son, actor/musician Evan Ross. They share two children together — their eight-year-old daughter Jagger Snow and their two-year-old son Ziggy Blu. That also means Ashlee's sister-in-law is Black-ish star, Tracee Ellis Ross.
6. Saweetie's cousin-in-law is NBA Hall of Famer Dwyane Wade.
Dwyane's wife, actor/author Gabrielle Union, is Saweetie's cousin.
7. Jack Ryan's John Krasinski and Stanley Tucci are brothers-in-law.
John is married to Emily Blunt, while the I Wanna Dance with Somebody star is married to Emily's sister, literary agent, Felicity Blunt.
8. Book Club star Mary Steenburgen's daughter-in-law is Lily Collins.
The Emily in Paris star married Mary's son, film director/screenwriter Charlie McDowell, in Sept. 2021. This also makes Mary's husband, Ted Danson, Lily's stepdad-in-law.
9. The Little Mermaid's Melissa McCarthy and Mark Wahlberg are cousins-in-law.
Melissa's cousin, Jenny McCarthy, has been married to Mark's brother, Donnie Wahlberg, since 2014.
10. Stranger Things star David Harbour is Alfie Allen's brother-in-law.
David is married to the Game of Thrones star's sister, singer Lily Allen.
11. Model Barbara Palvin is Cole Sprouse's sister-in-law.
The Riverdale star's twin brother Dylan Sprouse tied the knot with Barbara in July 2023.
12. Penn Badgley is the brother-in-law of Girls star Jemima Kirke.
The You star is married to Jemima's sister, doula Domino Kirke.
13. Class of '09 star Kate Mara is Joaquin Phoenix's sister-in-law.
Joaquin is married to Kate's sister, Women Talking star Rooney Mara. Kate is also married to Without Remorse actor Jamie Bell, which makes her the stepmother to his 10-year-old son, who he shares with actor/musician Evan Rachel Wood.
14. Songwriter/producer Jack Antonoff's mother-in-law is actor Andie MacDowell.
Andie's daughter, Maid star Margaret Qualley, and Jack wed in a New Jersey ceremony in August 2023.
