She captioned it, "Uncle matt" with three heart emojis.
The 52-year-old Today anchor announced she adopted Haley on Feb. 21.
"That little girl, Haley Joy, is my daughter!" she said. "I adopted her. She's a Valentine's baby so she's a little nugget ... She is the love of my life."
Her co-host, Kathie Lee Gifford, was excited by the news and tweeted at the time, "So thrilled for @hodakotb and her previous daughter, Haley Joy!! She will be the best mommy ever! We love you, Hoda, enjoy every moment!"