The 25-year-old dancer, who himself has a close relationship with singer Cheryl Cole, told People magazine Julianne Hough, 22, is a 'little young' to be hearing the sound of wedding bells.
He said: 'I haven't heard anything [about an engagement] and I am sure I would have if [the rumours] were true. I think she might be a little young. But we are all very supportive, and as long as she is happy that is what matters.'
Although the loved-up couple are not set to walk down the isle any time soon, Hough did insist Seacrest has fitted in well with the family.
'We are all very similar. It's his sense of humour, work ethic and how he always puts family first.'