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Janet Jackson made a surprise appearance at Los Angeles mall The Grove last weekend to personally witness a flash mob that featured a choreographed number to her greatest hits. [Scroll down to watch video.]

Flash mob is a term used to describe a throng of people in a public venue who suddenly break out in an elaborate dance routine — to the complete surprise of bystanders around them.

While Saturday’s event wasn’t technically a flash mob, because there was no element of surprise to the Grove shoppers, it was still impressive enough to help promote her new greatest hits album, which drops today.

As previously reported, Jackson told ABC’s Robin Roberts that she believes her brother was killed by his personal physician Dr. Conrad Murray, who has admitted to administering Propofol to Michael Jackson, but claims he didn’t kill him.

“He was the one that was administering … I think he is responsible,” Janet told Roberts in the interview set to air Wednesday. Janet also claims Murray should no longer be allowed to practice medicine.