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How do you keep 21 concert residency at the L.A. Forum fresh? Invite lots of guest performers.

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That’s exactly what[lastfm link_type="artist_info"]Prince[/lastfm] has been up to with guests performers like [lastfm link_type="artist_info"]Gwen Stafani[/lastfm] and  [lastfm link_type="artist_info"]Alicia Keys[/lastfm]. He’s been changing up the set list every night as well. But perhaps the freshest surprise came on Friday when Prince rose up from under the stage arm and arm with [lastfm link_type="artist_info"]Stevie Wonder[/lastfm] to perform “Superstition” as an encore!

Spinner reports Prince performed four or five encores and the concert went well past 1 a.m.!

This is not the first time these two legends have teamed up to perform together.

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