The 38-year-old fashion designer cracked a smile as she was photographed on Friday at LAX airport wearing a beautiful sapphire sparkler on that finger.
Simmons looked casual chic, sporting a white V-neck T-shirt, a beige sweater, skinny jeans, sneakers and sunglasses.
A source confirmed to E! News on Wednesday that Simmons and Leissner tied the knot.
While the lovebirds have yet to announce their marriage, Kimora's ex-husband Russell Simmons was the one to initially spill the beans on Twitter.