Exclusive
Maksim Chmerkovskiy has really big disco balls ... 'cause he's not only returning to "Dancing With the Stars" -- but he's going back with a bigger job ... TMZ has learned.
According to our ballroom sources, Maksim will make a surprise appearance Monday on "DWTS' ... as a guest judge.
We're told the show's former dance pro will be sitting right next to Bruno, Len and Carrie Ann during the semi-final performances.
Maksim peaced out of 'DWTS' back in February. Since then he's been running several dance studios, and starring in "Forever Tango" on Broadway.
In other words, same s**t ... different pay.
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