Chaz Bono Rob Kardashian Weight Loss [PHOTOS]: Reality TV Stars Reveal Slimmer Figures, Rob Hikes in Cali, Bono Looses 65 Pounds

Celebrity slim down is in full effect as the warmer seasons approach us.  Celebrities Chaz Bono and Rob Kardashian have been hard at work trying to shed the pounds, and according to news sources all of their hard work is paying off.

Rob put on a whopping 40 pounds after his break up with British pop star Rita Ora.  He told his sisters on an episode of "Kourtney & Kim Take Miami." "All I did was waste a lot of money and gain 40 pounds." "I need to focus on me." That's all I wanna be about."

Rob has been working on his fitness as The Huffington Post reported The reality star and sock entrepreneur, 26, went for a hike in Culver City, Calif., Wednesday, while sporting a shorts-and-spandex getup.

Maybe Rob can look at Chaz Bono for inspiration. The spawn of Cher recently lost almost 100 pounds, to reveal a slimmer and healthier look.

"Physically, my body feels just so much better," Bono told People magazine of his weight loss. "I'm in a lot less discomfort when I exercise and am doing physical stuff. All of my numbers are all normal now, which is great -- my blood pressure, my cholesterol. I just have a lot more confidence, and that feels really cool. I really like what I see in the mirror."

Bono has lost 65 pounds since announcing his plan to loose weight November 2012.