Surprise! Aaron Carter has put a ring on it and asked his ex-girlfriend Melanie Martin to marry him! The couple is back together after a whirlwind breakup in April and is ready to make their life together official. The 32-year-old singer proposed to Melanie this week and proudly showed off the giant sparkler to his fans on Friday, June 12. Taking to his Instagram, Aaron Carter posted a picture showing off the pricey diamond. Earlier this year, the couple went ring shopping and he was looking at dropping up to $80k!