Police are searching for a rhythmic thief who stole a straphanger’s wallet — then was caught on video dancing as she used her victim’s credit card.

The suspect allegedly snatched a wallet off a 22-year-old man after he fell asleep on the L train near the Myrtle-Wyckoff stop at about 9:30 a.m. on July 29, cops said.

Wearing a floral-print dress, pink headband and sunglasses, she then used the victim’s credit card to buy about $500 worth of clothes and other apparel at stores in Brooklyn, authorities said.

She was captured on video at a shoe store making one of those purchases, police said.

The video shows her nodding and tapping along to music at the cashier.