David Foster and Katharine McPhee are going strong several months into their relationship.

According to a new report, the 68-year-old music producer (and former reality star) gushed over his 33-year-old girlfriend, labeling the American Idol alumna as "my girl" during Steven Tyler’s viewing party in Hollywood for the 2018 Grammy Awards on Sunday night.

On Jan. 29, Us Weekly magazine shared details of their interview with Foster about his attendance at the Aerosmith frontman’s event to support the Jaine’s Fund charity benefitting sexual abuse victims. As Foster discussed his presence at the event, McPhee got his attention and waved him inside.

“Excuse me, I’ve got to go get my girl,” he gushed.

However, when Foster was asked about his relationship with McPhee, he wouldn't give away any details about their romance.

“Oh, we don’t talk about that,” he explained.

Foster and McPhee were first romantically linked to one another in May of last year after being friendly for the past several years. However, after getting cozy in Malibu, California last spring, the couple stayed private for several months. Then, last September, the couple began spending more time with one another in public before they were caught kissing in Beverly Hills in November.

“When Kat talks about David, her face lights up. She’s really so happy. They’re actually so sweet together,” a source told Us Weekly at the time. “The age difference might seem substantial to some, but they are really cute together and it makes sense.”

As for how his family feels about his relationship with McPhee, Sara Foster recently told Us Weekly magazine that he was on board with her father's current relationship. As she explained, she and the rest of Foster's kids are always honest about their feelings towards the women who come in and out of his life and never hesitate to make their opinions known.

“We just want someone that’s going to treat him well and that cares about him, and I think he’s with someone right now that really does,” she explained.

Foster and McPhee have continued to be spotted with one another in recent months and enjoyed a trip to Europe weeks ago. As for their future, an E! News report earlier this month revealed that the couple has no plans to wed.