David Foster and Katharine McPhee Are ‘Absolutely Not Dating’: Sources

David Foster and Katharine McPhee have had a close relationship since he first met the American Idol alum on the set of the hit reality singing competition when she was a contestant in 2006. But is their relationship more than platonic?
Those watching Foster’s daughter Erin’s teasingly playful Instagram stories Tuesday evening may have gotten that impression — but sources tell PEOPLE viewers missed the point completely.
“This is not at all true,” a source