Just a week after being spotted sitting front row together at the Calvin Klein Men's Collection fashion show in New York, Zac Efron and Joe Jonas both headed to Fred Segal to get in a little shopping on a rainy Friday afternoon.

It's unclear if they actually bumped into each other in the dressing room at the famous West Hollywood boutique, but the teen heartthrobs left separately.

While Zac is busy getting over his split with longtime girlfriend Vanessa Hudgens, Joe Jonas and Ashley Greene seem to be taking things to the next level -- in fact word is the Jo Bro even gave his Twilight beauty a "promise ring" earlier this year!

But that wasn't the last time we spotted Zac on Friday ... click below to see what the single and sexy celeb was doing last night!