Blac Chyna's teenage beau YBN Almighty Jay grabs her massive behind during shopping spree in Beverly Hills (Photos)

Blac Chyna,  29, and her teenage rapper-beau, YBN Almighty Jay, 18, were spotted on a shopping trip in Beverly Hills on Monday.

During the shopping trip at Saks Fifth Avenue,

the couple couldn't keep their hands off each other as they packed on the PDA. In one of the photos, the Houston rapper was pictured grabbing Chyna curvacious behind, while she held him.

See more photos below.