Katy Perry: "Last Friday Night" tops the 3 million mark
Katy Perry's "Last Friday Night (T.G.I.F.)" tops the 3 million mark in digital sales this week. It's Perry's seventh 3-million-seller, a total topped only by Rihanna, with eight. But Rihanna's total includes two "featured" credits. Perry was either solo or in the lead on all seven of her hits.