John Stamos is treating "Full House" fans to a musical update they never expected.

The 60-year-old actor teamed up with former "American Idol" contestant Jax to record a sweet new lullaby version of "Forever," the Beach Boys song his "Full House" character, Uncle Jesse, performed multiple times on the ABC sitcom.

Stamos sang the song as the frontman of the fictional band Jesse & the Rippers. He also memorably crooned it during his character's 1991 wedding to Rebecca (Lori Loughlin).

More than two decades later, Stamos reprised "Forever" for the debut episode of the Netflix revival "Fuller House" in 2016.

In real life, Stamos recorded the song with the Beach Boys in 1992. The actor has performed with the classic rock band many times over the years.

The '90s version of "Forever" was itself an update: An earlier rendition of "Forever," which was written by late Beach Boys member Dennis Wilson and his songwriting partner Gregg Jakobson, first appeared on the band's 1970 album, "Sunflower.

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In his collaboration with Jax, Stamos has turned the ethereal song into an even more harmony-drenched tune for little ones to enjoy.

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