Exes Fergie and Josh Duhamel shared rare photos of their son, Axl, on Saturday in honor of his 13th birthday. “Guess who’s a TEENAGER!?” the actor, 53, wrote via Instagram over the weekend. “Holy crap that went fast. “I love this dude so much,” the “Ransom Canyon” star continued. “I couldn’t have asked for a more kind, compassionate and thoughtful kid. HAPPY 13th B-DAY AXL JACK!!!” The social media upload included a slew of throwback snaps of the birthday boy, while Fergie’s carousel also highlighted more recent moments. “13. 🎂🎂 Wow, my teenager,” the former Black Eyed Peas member, 51, captioned her slideshow. “I’m saying that with tears…
