Uh oh! Justin Bieber and Hailey Baldwin got a little bit heated at hot yoga on Saturday -- when we spotted them leaving it looked like Justin was frustrated and Hailey was on the verge of tears!

Hailey appeared upset but she looked AMAZING, as usual. The model was wearing neon yellow biker shorts and a matching sports bra, showing off her toned abs. Justin was in full Drew House-gear.

The couple drove off, heading home in their Lamborghini Urus and we suspect Justin was still a bit tense later in the evening because he headed out for a cruise on his motorcycle just before midnight! Perhaps blowing off some steam following an argument?!