Matthew Gray Gubler is celebrating a major achievement with his new children's book, "The Little Kid With the Big Green Hand." Just two weeks after its release, the book has landed a spot on the New York Times bestseller list for the week of October 15. This is the second time Gubler has achieved this recognition, as his first book, "Rumple Buttercup: A Story of Bananas, Belonging and Being Yourself," also made the list in April 2019.

Gubler took to Instagram to share his excitement with fans, expressing his gratitude for their support. He posted a video from his book tour, thanking his readers for making his latest literary title a bestseller and admitting that words cannot fully convey his appreciation.

During the tour, Gubler made a special stop to celebrate the achievement with his former "Criminal Minds" co-star Joe Mantegna. He uploaded a sweet photo of the two together, revealing that even a flat tire and a broken fan belt couldn't stop him from sharing the good news with his friend.

Fans of Gubler and "Criminal Minds" were thrilled to see the reunion, expressing their love and excitement in the comments. Congratulations to Matthew Gray Gubler on this impressive accomplishment, and fans are eagerly looking forward to what he has in store next.