"You are one lucky lady (wink, wink)!" is not the opening line you should use in your wedding toast.
Complimenting the bride or groom is fine ("Congrats on the handsome hubby!"), but if you've had any kind of relationship with either one, we advise keeping it to yourself! No one wants to find out on her wedding day that her new spouse has hooked up with her best friend. Even if the bride is aware of your romantic history with the groom, other wedding guests might not be. Keep it light and classy, and if you simply must make a joke about steamy nights with the groom, send up your best wishes for a happy, happy honeymoon.