Jimmy Kimmel is telling all about what it's like to attend the "Avengers: Endgame" of parties.

The late-night host chatted on "The Howard Stern Show" about going to a star-studded bash with dozens of famous guests, including Taylor Swift, Travis Kelce, Mick Jagger, Bruce Springsteen and Steven Spielberg.

The party was held at Paul McCartney's house, and Kimmel explained he ended up there after going to a dinner whose host was invited to the gathering. There were about 100 guests, people were dancing in the kitchen, and Swift was DJing — although that may make her role sound a bit more involved than it was, according to Kimmel.

"She just had her iPhone and tapped into the house system," he said. "It wasn't like she was hired to work there."

But Kimmel confirmed that Swift's boyfriend joined her at the party, and the comedian's wife, Molly McNearney, chimed in that Kelce is "very good looking."

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The party was so ridiculously packed with A-list talent that Kimmel said he gravitated towards the people he already knew so they could say to each other, "Can you believe that this is happening and that we're here?" He did, though, have a "good chat" with Springsteen.

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"We talked about Elvis, and we talked about being in L.A.," Kimmel said. "We even had that moment (of), like, 'Can you believe this party?' Even Bruce Springsteen was like, 'This is some party.'"

Kimmel also chatted with Swift, although he didn't reveal details of the conversation.

For her part, McNearney described going into the corner to talk to Jennifer Aniston and Courteney Cox, whom she was "relieved" to see there.

"It was one of those parties (where) I didn't know how to hold my body," she said. "I didn't know where to look."

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Even though Springsteen and Cox were both at the party, the two never broke into their dance from the "Dancing in the Dark" music video, which the actress recreated on TikTok earlier this month.

Austin Butler reminisced with Kimmel about 'insane' star-studded party

This appears to be the same party that Austin Butler also attended, and when the "Dune: Part Two" star was a guest on Kimmel's show earlier this month, the two reminisced about the night. Kimmel described the bash as "maybe the craziest party I have ever been to in my whole life," and Butler agreed it was "insane."

"It was like a party where Tom Hanks is going, 'Oh my God, can you believe who's here?'" Kimmel joked.

Butler, meanwhile, recalled chatting with Springsteen about Elvis Presley, whom he played in the movie "Elvis," and being amazed to see Ringo Starr and McCartney in the same room. The actor also noted he was star-struck to see Meryl Streep, whom he met after eating vegan pizza by himself in McCartney's kitchen.

"I couldn't believe I was meeting Meryl Streep with Paul McCartney's vegan pizza in my mouth," Butler joked. "She was so sweet."