Kylie Jenner and Tyga arrived together at the American Music Awards in L.A. Sunday night.<br />The reality star, 18, and older sister Kendall entered the awards show with the rapper in tow before making their way to their seats.<br />"She's caught him lying and talking to other girls behind her back before, and this was the last straw," a Jenner source recently told PEOPLE, adding that Jenner "feels super betrayed and is just so pissed off, damaged and hurt about it" and that she's "absolutely fuming."
