Multiple witnesses say they saw Smith (who has a girlfriend) and a mystery woman sneak into a handicap-accessible toilet at Christchurch airport in New Zealand last month.
One witness was with his young son and told the media, "It was obvious what was happening."
The team suspended Smith for 1 game and the Prime Minister of New Zealand said he "embarrassed himself."
Now, Smith has issued a public apology -- saying, "I've made a huge mistake. A huge error in judgment."
"I’d personally like to say a huge sorry to my partner (girlfriend) Teagan, her family, my family.