Kelly Rowland paid tribute to her firstborn, son Titan, on Thursday and did so with a series of adorable pictures, including one of them hugging on a beach.MORE: Kelly Rowland sends fans into a frenzy in slinky leopard dressIn the photo, the singer is wearing a gorgeous green leopard swimsuit, which features a plunging neckline, and is completely makeup-free as she embraces her son, who turned seven this week.WATCH: See inside Kelly Rowland's $3.45million homeOther pictures are close-ups of