Tony Stewart and mom -- then and now

Reigning NASCAR Sprint Cup champion Tony Stewart didn't reach that high without his mom, Pam Boas. She remains by his side, too, serving as treasurer on the Tony Stewart Foundation's board of directors.

So on this Mother's Day, we give you a quick look at Stewart and Boas -- then and now:

And a special quote, as told to NASCAR.com in 2009, about the best Mother's Day gift from driver to mom:

"He made me a card when he was about 10 years old, and the card hard a single flower on the outside. He colored it with a crayon and made it from folded construction paper. Inside he wrote: 'Even though I love racing, I love you more.' I still have that. I don't need gifts, really; I just need hugs and to hear that he loves me."