Denise Richards is paying tribute to late friend and ex Patrick Muldoon on his heavenly birthday. “This was our last hug saying goodbye….. if only I hugged you tighter and longer,” Richards, 55, wrote via Instagram on Monday, September 28, sharing a photo of the pair with their arms around each other outside an aircraft. “We had just gotten off our flight from Scotland .. a whirlwind weekend with our starship troopers family. I loved how excited you were to land at LAX and have fancy PS pick us up & drive us across the tarmac.” She continued, “Always so humble..we hung...