Description:On Sunday, Jack Osbourne revealed that he has been diagnosed with multiple sclerosis, and yesterday ET caught up with Julie Chen, who co-hosts The Talk with Jack's mom Sharon Osbourne, getting her candid response to the situation in an exclusive interview. RELATED: Jack Osbourne Diagnosed with Multiple Sclerosis "We've known for a few weeks," Chen said about Jack's diagnosis. The ladies of The Talk remained mum on the subject out of respect for Sharon.(0:36)