The pair had dinner at Eveleigh in West Hollywood, California on Sunday night, where the source says they were “leaning over the table looking at each other, speaking very closely, laughing a lot.”
Holbrook and Monroe dined for about three hours before leaving together. The actor was apparently the perfect gentleman, offering The 5th Wave star his coat as the two exited into the rain. “They walked about 10 blocks and even held hands,” the source added.
Monroe has previously been linked to her Independence Day: Resurgence co-star Liam Hemsworth, while Holbrook split from actress Elizabeth Olsen in October 2014. He later revealed in an interview with Man of the World that the Avengers star broke up with him over the phone on the same day his friend, photographer David Armstrong, passed away.
"On the same day that my best friend died, I got a call from my girl to tell me it was over," Holbrook revealed in the interview, saying that the traumatic period spurred him to move to upstate New York and motorcycle through Chile.
Here’s hoping the new pair are lucky in love!
ET has reached out to Holbrook and Monroe's reps for comment.