SELENA GOMEZ JUSTIN & ORLANDO CAN KISS MY ...

While her ex and her alleged fling duke it out in Ibiza, Selena Gomez rocked the shortest of shorts Thursday while heading to a meeting in L.A.

As TMZ first reported, while Justin Bieber and Orlando Bloom fought over Miranda Kerr ... there is some tangential Selena involvement. 

Our sources say Gomez -- who was once famously photographed with Bloom -- claims she never hooked up with the "Lord of the Rings" star.

Selena Gomez ... hate to see you go, but love to watch you leave.