VIDEO : Ariana Grande Covers Whitney Houston Songs

Ariana Grande put her own spin on Whitney Houston's classics "How Will I Know" and "Queen of the Night" Thursday on the season finale of ABC's Greatest Hits. Blending styles from the '80s and '90s (while rocking her signature ponytail, natch), Grande looked and sounded like Houston in her heyday. The night was full of musical tributes, as Adam Lambert sang George Michaels' "Faith" and John Legend sang Lauryn Hill's "Ex Factor" and "Doo Wop (That Thing)."