Kylie Jenner
Kylie got this one from celebrity tattoo artist Bang Bang just after her 18th birthday. This tattoo is the phonetic spelling of the word "sanity." Rumor has it, she might have the inverse of this tattoo (the phonetic spelling of "insanity") on her other hip.
Lady Gaga
Gaga got this tattoo right after she collaborated with Tony Bennett. Bennett is a legendary writer of show tunes and pop music through the ages. The trumpet is his signature instrument, so she chose to get that, and his signature, tattooed on her arm.