Rihanna gave A$AP Rocky a ribbing while interviewing him.

The pals quizzed each other for Vogue and GQ’s “Face to Face” video series — and when RiRi asked A$AP to name the last item he purchased for less than $20, she suggested an answer: “Condoms?”

Actually, it was an $11 T-shirt. “It was tight,” he said. “I’ll take a free T-shirt. My favorite price is free-99,” he joked.

Surprisingly frugal for a guy with a dollar sign in his name.