Gwyneth Paltrow and Chris Martin looked "genuinely happy" while attending the same movie screening in East Hampton on Monday, July 28 -- get the inside scoop from the party! Credit: Kevin Mazur/Getty Images; Kevin Kane/WireImage

Another former celebrity couple gets an A for amicable! Gwyneth Paltrow and her estranged husband Chris Martin both attended a screening of Hector and the Search for Happiness in East Hampton, New York on Monday, July 28. An observer told Us Weekly that the former couple, who announced their "conscious uncoupling" in March, looked at ease together at the event and afterparty.

Simon Pegg, who stars in the upcoming movie alongside Rosamund Pike and Toni Collette, was introduced by Paltrow as "my very dear friend and my daughter's godfather." With Martin also seated in the crowd, Paltrow went on to say the family was "very proud" of Pegg. "He's the biggest movie star in our family," she concluded.

According to the observer, Paltrow entered the movie theater shortly after Martin, who did not pose with his estranged wife. Still, Paltrow "was all smiles and joyful," the insider noted of the Goop founder. Pegg graciously thanked Paltrow for hosting the event upon taking the mic.

Later, stars convened at the Serena & Lily Beach Market for a celebratory cocktail party. "Paltrow mostly talked to partygoers and was completely engrossed in conversation," the observer noted. The father of her children, meanwhile, hung out with Paltrow's mom Blythe Danner, at a table in the courtyard.

"It was all very chill and laid back," the eyewitness told Us.

"At one point towards the end of the party, Martin hung out with Paltrow for about 15 minutes," the observer noted of the couple, who seemed like "good, good friends," adding that "they looked genuinely happy to be in each other's company. They weren't holding hands or hugging… [but] left the party together."

The Coldplay rocker, 37, opened up about his relationship with Paltrow, 41, in a recent interview, noting that the two have remained amicable since their split announcement. "We are very close, we are not together," he told Valentine in the Morning last Friday, July 25. "You know, there's a lot of love. So there nothing—there's no scandal, I'm afraid. i wish I could give you scandal."