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We all know that Kanye West was a huge fan of Justin Bieber's Purpose track "What Do Ü Mean?" (see evidence below). So when Pablo was caught dancing by wife Kim Kardashian at Bieber's Purpose World Tour stop in Los Angeles on Monday night (March 21), all we could do is just slap on a big 'Ye grin and bop along with him.

If you're paying close attention to Kim KW's Snapchat story (you should be), last night you'd see that Kanye made an appearance while unabashedly bobbing along to his fave track.

The Wests weren't the only family present at the L.A. show on Monday: Justin's own mother was in attendance.

"So good," Pattie Mallette wrote, sharing an Instagram from the soundboard.