Reality TV star Spencer Pratt has apologised to Mary-Kate Olsen for calling her the "less cute (Olsen) twin," after she joked about his bad temper during a late-night TV appearance.

Olsen upset The Hills star when she recalled high school memories of Pratt during a recent appearance on The Late Show with David Letterman, revealing he was a star soccer player who often flew into a rage on the pitch. Pratt immediately proved her right by attacking Olsen in the media.

But now he admits he let his emotions get the better of him: "I apologize for getting caught up in trash talking, but she brought up an emotional subject when she mentioned the soccer stuff."

Pratt tells Us Weekly magazine he has nothing but the utmost respect for his old school pal: "I'm secretly jealous of her. I want my face on a lunchbox, too."

-Spencer Pratt Pictures
-Mary-Kate Olsen Pictures

(This news article provided by World Entertainment News Network)