Tate McRae was “so embarrassed” when Justin Bieber reminded her that she danced for him as a child. The 20-year-old pop star performed one number at Justin’s concert in Calgary for the Purpose World Tour in 2016 before she shot to global fame on TikTok and the factoid even made it onto her Wikipedia page but she told her fellow singer to never mention it again when she met him years later as an adult. She told E! News: “I did. It was like one time, but I was 12 and it’s this whole Wikipedia thing. He did bring it up, and I was so embarrassed. I was like, ‘Please never bring that up again.’ “Bu…