However, Aaron sees how happy Aldous is while performing and heads home to reconcile with Daphne.
Months later, Aldous, sober again, has returned to fame with a single (produced by Aaron) based on events from their night in Las Vegas.
Jackie has been sleeping with Metallica's drummer, Lars Ulrich (playing himself), and confesses that Naples is not actually Aldous' biological son.
Sergio sends Aaron to London to escort Aldous to Los Angeles.
Daphne informs Aaron that she has received a job offer in Seattle and that they are moving there. Aaron meets Aldous and learns that he had not been expecting him, thinking that the concert was not for two months.
In 2009, British rock star Aldous Snow (Russell Brand) releases an album and a titular single, "African Child", which is a commercial and critical failure. Meanwhile, in Los Angeles, Aaron Green (Jonah Hill) works as a talent scout at Pinnacle Records, a record company.
In an interview, Aldous' girlfriend, Jackie Q (Rose Byrne), drunkenly declares they have a boring life. He lives with his girlfriend, Daphne (Elisabeth Moss).
Variety initially announced the project would focus on "fresh-out-of-college insurance adjuster (Hill) who is hired to accompany an out-of-control rock star (Brand) from London to a gig at L.