While celebrities filled Adam Levine's "loose, romantic and fun" wedding ceremony this weekend, Jonah Hill stood front row center as he officiated the event.

Adam Levine Nervous To Sing At Wedding?

The Superbad actor definitely brought the funny as Maroon 5's lead singer tied the knot with Victoria's Secret model Behati Prinsloo at Flora Farms in Cabo San Lucas, Mexico, E! revealed Sunday.

An insider said, "Jonah was hysterical. He was telling so many jokes, but then in the middle would be so sweet and sincere. He also talked about how sweet Behati is and how perfect they are for one another."

One specific joke the source remembered was Hill's laughter about how he and Levine used to skateboard with Robert Downey Jr. and Stevie Nicks when they were younger.

"He set up the joke perfectly. His timing was amazing. Everyone was giggling."

Prinsloo's father, who works as a minister, also stepped in and blessed the couple.

The insider said Levine and Hill have known one another for "such a long time" while adding that Levine is a "wonderful guy and has so much to give."

Levine's guitarist also lent his talent to the festivities as he played while the husband and wife walked down the aisle.

Prinsloo's lace wedding gown stole the show with spaghetti straps and tulle that went from her knee all the way to the floor. She completed her look with a traditional veil before switching it up and rocking a "long, white sexy number" for the reception.

Many of Prosloo's fellow Victoria's Secret models stood by her side as bridesmaids and also wore all white while the groomsmen wore black Hawaiian shirts with black dress pants.

Nicks performed during the reception and Levine even joined her on stage! Prinsloo also belted out Bright Eyes for her new husband.

A separate insider revealed singing to Levine at their wedding was a wish Prinsloo always had since they first began dating.

"So it was kind of a bet between them. He introduced her and she sang it. She had a beautiful voice."

Guests enjoyed "fresh, seared tuna, lovely salads, everything was organic and amazing. Drinks were flowing. There was every kind of mojito you can imagine, Jalepeño and carrot to cucumber."

The couple will head to South Africa for their honeymoon.