Brooke Mueller -- I Bought Mel B's Old House!

Turns out what Brooke Mueller really wanted ... what she really, really wanted ... was Mel B's house -- because TMZ has learned she just bought it and moved in last week. Zigazig ah!

Sources close to Brooke tell TMZ she plunked down $3.3 million for the Tarzana home that the Spice Girl bought back in 2009. We're told Brooke has been looking for a place since she got out of rehab and wanted a place that was outside of the Hollywood scene.

According to our sources, Brooke put down the money for the 5 bedroom, 8 bathroom house herself -- and didn't get any of the money from ex Charlie Sheen.