The actress shared on Instagram a photo she kept of the actor from when she was 13.
Kate Beckinsale revealed recently on Instagram that she had a crush on Rob Lowe as a teenager, and it turns out, the feeling is mutual.
On Wednesday, ET's Nischelle Turner caught up with Lowe at the Los Angeles premiere of How to Be a Latin Lover -- which hits theaters on April 28 -- and he admitted that he was flattered upon hearing of the 43-year-old actress' fondness for him. Last week, Beckinsale disclosed her crush by sharing a photo of a postcard she wrote as if it was from Lowe. The note read: "Dear Kate, Yes I will marry you. See you soon. Love, Rob."
"EITHER I was a really tragic 13 year old with time on my hands." Beckinsale quipped in the caption, "OR Rob Lowe was all kinds of casual proposing marriage via a postcard of himself, signing his last name AND drawing a dick instead of using a stamp. (found at my mum's house)"
"So amazing, she’s one of my favorites," Lowe said of the Instagram post. "That made my day."
"What’s great about this business is you wake up one day and you go, 'Wait, this really happened, amazing," added the 53-year-old actor, who's been married to his wife, Sheryl Berkoff, since 1991.
Lowe also dished on what he found to be the "defining quality of a good lover," given he was at the Latin Lover premiere, noting that "inventiveness" is key.
The Parks and Recreation star isn't the only handsome man in his family. The actor's two sons, Matthew and John Owen, will be starring with their dad on A&E's The Lowe Files, which has them investigating America's spookiest urban legends. While shooting the show, Rob and his sons celebrated the actor's 53rd birthday by paying a visit to the house where he filmed The Outsiders in 1982.
"It was amazing. I mean, I was younger than my boys are when I went and did that movie, and it brought all kinds of memories back," Lowe told ET of the trip. "It would be like going back to your college dorm and walking through the hallways, and going, 'I remember what happened here.'"
WATCH: Rob Lowe's Sons Reveal How Their Dad Embarrasses Them -- 'He's Like a Man Child'