AceShowbiz -

Are Ariana Grande and Mac Miller getting married soon? Rumor has it, the "Dangerous Woman" hitmaker is already planning for nuptials with the "Donald Trump" rapper whom she started dating in August.

"Ariana has always wanted to be married by 25, and Mac checks all of her boxes," an insider tells Life & Style magazine, "She thinks he's cute, sexy and he makes her laugh all the time." According to the insider, the couple is moving fast because they're so compatible.

"Mac and Ariana have a lot in common. They're both from the East Coast, they're close to their families and they love a lot of the same music, TV shows and films," adds the insider.

Ariana and Mac are already planning their "dream nuptials," the source says, "They would both love it to be outdoors, on an island, surrounded by a dozen bridesmaids and groomsmen. She wants a one-of-a-kind designer dress, white with diamonds, off the shoulder, with a veil and the longest train ever. And she wants Mac in a white tux."

And for the baby plans, the source reveals, "Ariana wants to wait a few years before she gets pregnant. But she and Mac both do want to start a family while they're still young."

A rep for Ariana hasn't commented on the report yet.