updated 01/09/2012 AT 1:00 PM ET
•originally published 01/09/2012 AT 1:30 PM ET
Pink and her pro-motocross hubby Carey Hart may have tough exteriors, but the affection they share for one another brings out their softer sides.
“Happy anniversary to my beautiful wife who I love so much,” Hart, 36, Tweeted on Saturday. “Six amazing years and you haven’t killed me yet. I’ll love you forever.”
Pink, 32, doesn’t deny her mutual adoration for Hart, who is the father of her daughter Willow Sage, but she does joke that the rough times are yet to come.