Kelly Osbourne Says Son’s ‘Terrible Twos’ Have Left Her ‘Exhausted’: ‘It’s Insane’ (Exclusive)

Kelly Osbourne is in full mommy mode. 

The TV personality, 40, opened up to Us Weekly exclusively about her son, Sidney, entering his “terrible twos,” a childhood development phase that often includes tantrums and more expressive emotions. 

“It’s insane. I never get a second,” Osbourne shared at the Clarins ICONS Event in Los Angeles last week. “I’m exhausted every night. I can’t believe I’m even out today, but I’m very excited to be…