The actress recently revealed her mother Susan is a huge fan of her beau after they bonded at his recent birthday party.
In an interview with E! News, Hilary laughed: "My mom was at Matt's birthday and she was like, 'I just love him. I love him so much. He's the best.' I'm like, 'I'm here. I exist, you know? You're always on my side!'
"She's such a traitor."
Hilary agrees with her parent that she has a keeper in Matthew.
She said: "I got a really nice guy. He's so great."
Revealing she was back on with Matthew for the third time, Hilary said at the time: "It's going so great."
She also compared her reconciliation to Selena Gomez and Justin Bieber's on/off relationship, admitting "timing" plays a big part in a relationship.
She said: "I mean, this is like the third time that we've dated and I think that what [Selena] says has so much merit to it. Timing is such a big deal ... third time's a charm.
"I think that you have history and a past with someone and love, and just because it doesn't work out the first time, the second time, as long as there's not too much damage done, then, it can always work out again."