Two hot women ... two tiny bikinis ... but you can only CHOOSE ONE!!First, "Pretty Little Liars" star Lucy Hale -- she's 24, she's in Hawaii, and she's smokin' hot. Next, Christina Milian -- she's 31, she's in Miami, and she's also smokin' hot. Choose wisely.Bonus Fun Fact -- besides being a huge singer, Milian also co-wrote the Justin Bieber smash hit "Baby." So, take that into consideration.