Kate Beckinsale Reveals 'Marriage Proposal' From Teen Crush Rob Lowe With NSFW Postcard

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Even as a 13-year-old girl, the actress was quite the jokester.

Even as a teenage girl, Kate Beckinsale was quite the jokester.

On Tuesday, the 43-year-old actress revealed that she had a major crush on Rob Lowe when she was a teenager -- so much so that she wrote herself a postcard as if it was from him. "EITHER I was a really tragic 13 year old with time on my hands." she quipped, "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)"

WATCH: Kate Beckinsale Dresses Up as a Penis!

Beckinsale herself is most certainly the celebrity crush of many fans. This past week, she shared several swimsuit photos of herself while vacationing with 18-year-old daughter Lily. "Happy oh happy," she captioned a bikini selfie.

Meanwhile, Lowe is busy promoting his A&E show, The Lowe Files, that also stars his sons, Matthew and John Owen. The father-son trio appeared on The Ellen DeGeneres Show last week, and the boys admitted that their famous dad does embarrass them at times.

MORE: Rob Lowe Dishes on Son's 'Wild' 21st Birthday in Vegas, Recalls Own 21st Birthday with the Brat Pack

"He's like a man child," John Owen said. "He's a teenager trapped in a 53-year-old's body."

Here's more of the Lowe guys' interview: