ET caught up with Harrison at KIIS FM's iHeartRadio Jingle Ball presented by Capital One.
Horstmann also told ET there's some 'drama' on Underwood's upcoming season, and it'll end like it never has before.
The longtime 'Bachelor' host also dished on whether Underwood will get past the 'cocktail joke' of his virginity.
ET's Lauren Zima shares new details, including a potential big reveal, about Colton Underwood's season of 'The Bachelor.'
The 26-year-old former NFL player promised Bachelor Nation that his special someone has a 'great personality.'
The first footage of season 23 of 'The Bachelor' is here, and the trailer shows Underwood in tears, even walking away from cameras.
The show rarely breaks the fourth wall -- but Underwood's season is sure to be full of firsts.
ET's Katie Krause chatted with Nick following his 'DWTS' return during Monday night's finale episode.
Higgins also opened up to ET about whether he'd consider being 'The Bachelor' again.
The 'Dancing With the Stars' finale delivered a hilarious performance with 'Bachelor' alums, plus a sneak peek at Colton Underwood's se
During Monday night's season finale of 'DWTS', ABC dropped the first footage of Colton Underwood's upcoming season of 'The Bachelor.'
'What does he have to lose?'
The Bachelor Nation fan-favorite has a new man in her life!
Ava Friedman, 16, helped to protect the $7.4 million property featured on the ABC series.
