"He really rubbed off on me," Spencer said on "The Ellen DeGeneres Show" Wednesday. "I was kind of stalking him on Instagram and I didn't think it was real, [him] waking up and working out at 4 o'clock...they really do get up every morning."
The actress explained that while she technically only had one sweat session with Wahlberg, she learned so much from the "Mile 22" star.
"I did one [workout] and that was enough," Spencer said. "All joking aside, he is such a fitness guru that he actually has helped me modify what I've been doing with my trainer."
"I love him for that," she continued. "Fitness and weight loss is such a personal journey, so when you have a god like that going, 'Hey, let me help you,' you're like, 'Thank you, god!'" She's been chronicling her fitness routine on social media ever since.
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"The Help" star also spoke about the current status of her dating life to "celebrity matchmaker" Ellen. The daytime host asked Spencer if she's seeing anyone at the moment and if there's a certain star she's got a crush on.
"Kinda, not really," Spencer said. "But did Brad Pitt say something about me, is that what this is about? 'Cause I saw him Sunday, I saw Brad Pitt Sunday night, and I squeezed him. Is that what this is about?"
"You squeezed him and then the security --" Ellen began.
"His face lit up and then security whisked him away," Spencer said. Both Pitt and Spencer attended the Hollywood Film Awards over the weekend.
"Well, you can hook me up with Brad," she said. "But we're just friends, Brad and I, don't start that rumor, Ellen. Brad and I are just friends. Brad Pitt."