Aaron reportedly started dating Mallory a month after his relationship with Blu of Earth ended.
They appear to be friends because they have attended a number of football games together.
According to an insider, Mallory has always wanted to be Aaron's girl and be in the spotlight.
Some believe they didn't get together sooner because of their age difference.
Mallory's Instagram is full of saucy photos.
Some photos show her in two-piece bikinis posing on the beach, at the beach, and at birthday parties.
Aaron was dating and engaged to the actress Shailene Woodley before he met Mallory.
After a two-year engagement, the couple called it quits earlier this year.
The actress showed her Instagram followers how she felt by lying down.