Kourtney Kardashian was wearing a t-shirt that said “cougar” while out and about with her sister Kim Kardashian in Calabasas, Calif., Wednesday.

Kourtney Kardashian ‘Cougar’ T-Shirt

Kourtney hit the shops with Kim in a t-shirt emblazoned with “Cougar Lounge Beverly Hills” and a drawing of the animal in question. Since “cougar” is slang for a woman who likes to date younger men, many think that Kourtney, 36, was referring to the rumored fling she had with 22-year-old Justin Bieber.

Bieber came close to validating the casual relationship in an interview with The Bert Show that aired in January. When the host asked about the fling with Kourtney, the singer said, “I’m being used, man. What can I say?” When pressed about whether or not the two were in a relationship, he said, “Nah, we’ll leave it at that.”

He then added, “No, no, but for real, she’s great. I’ve known [the family] for years.”

Back in December it was widely reported that Bieber and Kardashian had been “hooking up” since October. “Justin bragged to friends recently that he has been hooking up with Kourtney Kardashian,” an insider told Us Weekly.

A second source added, “Oh, yeah, that’s definitely happening and has been for some time now. Every time Kourtney and Justin are together they’re extremely flirtatious. They text each other all the time.”

Neither Kourtney nor Bieber ever actually confirmed their brief romance, and Bieber has since moved on to casual relationship with Hailey Baldwin and others.

WATCH THE uINTERVIEW WITH KOURTNEY KARDASHIAN!