Aaron Carter’s ex-fiancée got a DNA test to prove that the late singer is the father of her son. Melanie Martin – who was in an on/off relationship with Aaron between 2020 and 2022 – revealed she got the test to finally prove once and for all that her son Prince is Aaron’s biological child. She told TMZ that after years of “baseless” speculation, the test proves Prince’s paternity “without a shadow of a doubt”. She added to PEOPLE: “We’re doing good. He will be turning three soon. [We are] lucky to have each other. He’s the best little boy, and he’s really smart.” Prince was born on Nov. 22, 2…