Close encounters of the awkward kind!

Exes Renee Zellweger and Bradley Cooper nearly had an unplanned red carpet reunion at Monday's Costume Institute Gala Benefit at the Metropolitan Museum of Art in NYC.

Cooper, 36, appeared on the star-packed red carpet with a beloved date: His mother, Gloria.

PHOTOS: See all 60-plus A-list stars and what they wore at the Met gala

Just 20 minutes later, his former love Zellweger, 42 -- they called it quits in March after two years together -- was one of the last arrivals. She showed up solo, looking stunning in a Carolina Herrera gown. No word yet on whether the exes interacted once inside the lavish fete.

After the Met bash, Zellweger then made an appearance at an after party held at hotspot Crown; the late-night fete was also attended by Eva Mendes, Salma Hayek, Kanye West, Bruno Mars, Janelle Monae, Zoe Kravitz, Paul McCartney, Naomi Campbell, Jay Z, Beyonce and Madonna.

PHOTOS: The most shocking splits in Hollywood

An insider actually spotted Cooper nearly enter the party -- before suddenly changing his mind and getting back into his his car to drive away.

Why did Cooper and Zellweger call it quits anyway?

PHOTOS: Yikes! See Renee in a horror B-movie before she was famous

"She tried to make it work, but in the end it was too hard...she's okay," a confidante close to the actress told Us.

Added a Cooper source: "Bradley's absolutely obsessed with his career to the point that he cannot focus on anything else."

Get more Us! Follow us on Twitter, Friend us on Facebook, Subscribe to Us Weekly