Kelly Osbourne has been diagnosed with gestational diabetes. The 37-year-old star was diagnosed with the condition as she entered her third trimester of pregnancy. Kelly – whose symptoms have included weight gain, fatigue and ankle swelling – said: “First of all, gestational diabetes is not your fault. “At first I thought it was something that I had done. I only got diagnosed with it well into my third trimester, so it wasn’t like I developed it as some people get it from the get-go when they’re pregnant. “I got it in my third trimester and basically, I thought it was something that I had done…