Carly Rae Jepsen and her Milwaukee fans received an unexpected surprise during her Friday night performance. "Full House" star Bob Saget joined Jepsen on stage following his stand-up show at a venue nearby and once he got up there, she convinced him to stick around long enough to sing the "Fuller House" theme song.

Saget admitted he barely knew the words, but the 30-year-old singer and her audience helped him fill in the blanks. Jepsen recorded her own version of the classic "Full House" theme, "Everywhere You Look," for the Netflix spinoff.

The "I Really Really Like You" was visibly stunned as Saget came on stage. Before their duet, the 59-year-old comedian snapped a selfie with the "I Really Really Like You" singer and then turned around to capture all the fans inside the Milwaukee Turner Hall.

"Full House" creator Jeff Franklin wrote the theme song for the original series that ran for eight seasons on ABC. He enlisted the producer Butch Walker to write a new verse for the song to use as the theme of "Fuller House." Walker then helped Franklin land Jepsen to sing it, and she saw the opportunity as a dream come true.

"This was one of those moments where I was like, 'hold the phone!'" she said. "'Full House' was my childhood....so we made it happen."

She was so excited during the actual recording that she could barely keep it together at moments.

"There's some very embarrassing b-roll actually of the day that I recorded the song and they catch me like squealing in between takes...like, can you believe this is happening?!" the "Call Me Maybe" singer said.

Jepsen is in the middle of her North American tour to promote her latest album "Emotion." Her next stops include Nashville on March 14, Covington, Ky. on March 17 and Pittsburgh on March 18.

The complete first season of "Fuller House" is streaming on Netflix. The show has been renewed for a second season to premiere next year.

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