Bruce Jenner can't be contained ... well, not by his shirt anyway.
B.J. hit up Starbucks Saturday afternoon in Calabasas after a round of golf, and got all crazy -- untucking his shirt on the way in for a more casual look.
As we previously reported ... Bruce is dating one of Kris Jenner's best friends named Ronda Kamihira -- and we're told his ex-wife has been crying every night over it.
Bruce and his ponytail ... seem okay with the single life.
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