The 46-year-old actress had a lot of fun writing letters to various celebrities when she was younger.
The star said she once received a poster in response to a note she'd sent to her late music icon Jackson, reported Femalefirst.
"When I was a kid I would write to lots of people. I remember I wrote to Michael Jackson. I think I got back one of the posters that was on my wall," Spencer said.
"I'm still star struck all the time. I met Steven Spielberg, who I've idolised since I was a 13-year-old kid. And Oprah Winfrey.
"I think when I stop being star struck it's time to get out of this business," she said.
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