1. Blake Lively's brother-in-law is Bart Johnson (aka Troy's dad from High School Musical).
Bart is married to Blake's sister Robyn Lively.
2. Mark Ronson's mother-in-law is Meryl Streep.
Mark is married to Grace Gummer, Meryl's daughter.
3. Ethan Suplee (remember from Boy Meets World?) is Juliette Lewis's brother-in-law.
Ethan is married to Juliette's sister Brandy.
4. Julia Louis-Dreyfus's brother-in-law is Patrick Fischler (fromTwin Peaks and other stuff).
Patrick is married to Julia's sister, fellow actor Lauren Bowles.
5. Zooey Deschanel's brother-in-law is David Hornsby, aka Cricket from It's Always Sunny in Philadelphia.
David is married to Zooey's sister, Emily Deschanel.
6. Alfie Allen's brther-in-law is David Harbour.
David is married to Alfie's sister Lily Allen.
7. Penn Badgley's sister-in-law is Jemima Kirke.
Penn is married to Jemima's sister Domino Kirke.
8. Priyanka Chopra and Sophie Turner are sisters-in-law.
Each of them is married to a Jonas brother (Priyanka to Nick, Sophie to Joe).
9. Cameron Diaz and Nicole Richie are sisters-in-law.
Nicole is married to Joel Madden, and Cameron is married to Benji Madden.
10. Emily Blunt's brother-in-law is Stanley Tucci.
Stanley is married to Emily's sister Felicity.
This also makes John Krasinksi and Stanley Tucci brothers-in-law.
11. Lily Collins has multiple parents-in-law: Malcolm McDowell, Ted Danson, and Mary Steenburgen.
Lily married Charlie McDowell, Mary's son with Malcolm, her ex-husband. But Ted is part of the family now, so he's her other father-in-law.
12. Peter Sarsgaard and Jake Gyllenhaal are brothers-in-law.
Peter is married to Jake's sister, Maggie Gyllenhaal.
13. Patrick Wilson and Scott Foley are brothers-in-law.
Patrick is married to Dagmara Domińczyk, and her sister Marika Domińczyk (she played Eliza in Grey's Anatomy) is married to Scott.
14. Ashlee Simpson's mother-in-law is Diana Ross.
Ashlee is married to Diana's son Evan.
This also means Ashlee's sister, Jessica Simpson, and Tracee Ellis Ross are sisters-in-law (kinda) because Tracee is Evan's sister.
15. Eric Christian Olsen's sister-in-law is his TV wife, Daniela Ruah.
Daniela is married to Eric's brother, David.
That also makes her the sister-in-law of Sarah Wright, who is married to Eric.
16. Jamie Bell and Joaquin Phoenix are brothers-in-law.
Jamie is married to Kate Mara, and her sister, Rooney, is married to Joaquin.
17. And finally, Eddie Murphy and Martin Lawrence are maybe future parents-in-law (????).
Eddie's son Eric and Martin's daughter Jasmine are together and in lurve.
