Selena Gomez is a true fan of Ariana Grande’s music! On Wednesday, the Only Murders in the Building actress, 31, made a guest DJ appearance on SiriusXM Hits 1 and gushed about how the “Thank U, Next” singer, 30, has a catalog of songs that always put her in a great mood. Before playing Grande’s 2019 single “7 Rings,” Gomez …