Taylor Swift, Harry Styles Spotted Holding Hands After New York Show

Take note, Haylor seem to be heating up. After Taylor Swift and Harry Styles hit up the Central Park Zoo on Sunday, the rumored couple partied together on Monday night. The hangout session took place hours after One Direction played their headlining show at Madison Square Garden.

In addition to Swift (wearing a little black dress), they were also joined by opening act Ed Sheeran at the exclusive afterparty held at a hotel in New York City. In footage posted online, the boy band is spotted entering the fete, followed by Swift and later by Sheeran. Ed even spoke to paparazzi waiting outside the party, opening up about playing MSG along with his friends in 1D. He said, "It was all right, a lot of fun, cool."

Inside the get-together, photos were snapped of Swift, along with Styles and fellow 1D singer Niall Horan all up onstage singing karaoke. They reportedly sang "I Want It That Way" by the Backstreet Boys.

According to the Mirror, Harry and Taylor left the bash together at around 3:30 a.m. Shortly after, they were spotted holding hands when they arrived at her hotel, The Daily Mail reports.

While Taylor and Harry have both remained mum on Twitter post-party, Niall did take to the social networking site to share how happy he was about playing the headlining gig at MSG. He wrote, "Wow, madison square garden,thank you soo much! It was the best night of our lives! Thank you thank you thank you ! #1DinMSG Goin t sleep! Chat tomorrow! Still can't believe we just played@thegarden ! Thank you."

"What a night! I had soooo much fun! Thank you to everyone who came to see us and everyone of our fans who support us! I love you loads :)," Liam Payne added.

Haylor: The Timeline!

Interestingly enough, earlier in the night, Swift spent some time with the Kennedys. She attended the Robert F. Kennedy Center for Justice & Human Rights gala, where she was honored with the Ripple of Hope Award, E! News reports. Wearing a sparkly gold cocktail dress, she was spotted with pal and "Glee" star Dianna Agron at the event, which was thrown by her ex, Conor Kennedy's dad, Robert F. Kennedy, as well as Rory Kennedy and Ted Kennedy Jr.

Swift also performed at the event held at the Mariott Marquis in NYC. She sang her Red tune, "Starlight." The track is about Ethel Kennedy.