Jake Gyllenhaal Was In 'Good Mood' During First Appearance After 'All Too Well' Rerelease

Jake Gyllenhaal appears unfazed despite being the center of attention across social media over the weekend following the release of Taylor Swift's "All Too Well" short film and 10-minute version.

One day after Swift dropped her new version of "All Too Well" — which is widely speculated to be about their split — the "Brokeback Mountain" actor stepped out in Los Angeles Saturday to support his sister, Maggie Gyllenhaal, and to present a trophy at the Hamilton Behind the Camera Awards.

"Jake was in a good mood," an eyewitness told Us Weekly of Gyllenhaal's demeanor at the Saturday event hosted by luxury lifestyle publication Los Angeles Confidential magazine. "He was proud to be there to present the award for sound editing to Mandell Winter."

Gyllenhaal arrived at the event solo after the red carpet wrapped, the insider added. The 40-year-old star was reportedly "escorted" inside before presenting an award to the sound editor for his Netflix flick, "The Guilty."

Gyllenhaal, who stars as Joe Baylor in the thriller, was seated at "The Guilty" table with co-stars Riley Keough and Peter Sarsgaard, the source said.

His sister, Maggie, who is married to Sarsgaard, 50, was also seated at the same table. The actress took home the breakthrough director award for her directorial debut, "The Lost Daughter," during the event, Page Six reported.

The "Nightcrawler" star's appearance at the awards show came just hours after Swift dropped the short film for her track, "All Too Well," starring Dylan O'Brien and Sadie Sink.

The short film reportedly featured several Easter eggs about their brief romance, while the lyrics Swift added in the new 10-minute version appeared to confirm that they split in 2010 due to their age difference.

"You said if we had been closer in age maybe it would have been fine / And that made me want to die," Swift sings in the new version.

She also sings in another part of the song, "And I was never good at telling jokes, but the punch line goes / I'll get older, but your lovers stay my age."

Gyllenhaal is 9 years older than Swift, who was 20 when they dated from October to December 2010. At present, he is dating 25-year-old model Jeanne Cadieu, while Swift has been in a long-term relationship with actor Joe Alwyn.

Meanwhile, some Swifties have allegedly started coming after another one of her exes, John Mayer, ahead of the release of "Speak Now (Taylor's Version)," which includes the song "Dear John." Fans of the pop star believe the song was written about Mayer, whom she dated from December 2009 to February 2010.