Kylie Jenner Receives $5,000 Solo Cup Floral Arrangement

Kylie Jenner is no stranger to flowers or cash ... so clearly nothing makes more sense than to gift her a gigantic solo cup made of roses ... which comes with a hefty price tag.

Jenner showed off the creation from La Fleur Bouquets Thursday -- a 21st birthday gift she got from her friend, Yris. We're told the "Legal AF" solo cup was made with more than 1,000 real roses -- and comes in right around $5,000.

The arrangement was just one of several gifts Jenner got for her 21st, not to mention the gigantic party she threw at Delilah in West Hollywood ... with guest that included her fam, along with Bella Hadid, The Weeknd, Dave Chappelle and baby daddy Travis Scott.