Miley has several tattoos so it's not surprising to hear that she also got one under one of her boobs. Hers says "just breathe," in honor of her friend Vanessa who died of cystic fibrosis.
One of Ari's oldest tattoos is on her left side and features the word, "Bellissima," meaning "gorgeous" in Italian. Ari previously said that her grandfather used to call her that when she was younger.
Lucy has a ton of tattoos and one of them includes "courage, dear heart," which is on her left side. The quote comes from the book The Voyage of the Dawn Treader from The Chronicles of Narnia series.