Matthew McConaughey and Camila Alves no-shows at 'Killer Joe' bash

Camila Alves needs her mama-to-be sleep.

Matthew McConaughey and wife Alves - who is expecting the couple's third child - hit up the Cinema Society's screening of McConaughey's flick "Killer Joe" on Monday night but opted out of attending the after-party.

"The new addition presumably kept the couple in for an early evening," a source dished.

A bevy of celebri-guests did make it to the bash, held at No. 8 in Chelsea, though, including John Stamos, Courtney Love, Tony Danza and Carla Gugino, who sipped Woodbridge by Robert Mondavi wine.

Thursday, Alves is slated to hit up No. 8 for a party celebrating her new ad campaign for Macy's brand INC International Concepts.