Nick Viall 'Definitely Remembers' One-Night Stand With 'Bachelor' Contestant, He Says

"The Bachelor" premieres at 8 p.m. ET on ABC, tonight.

— -- "Bachelor" Nick Viall acknowledged that he will see a familiar face during tonight's Season 21 premiere of the hit reality TV show.

"Oh I definitely remembered, yeah," Viall said of when he saw Sandoz on the show. "At that point, I had already met about 14 other women ... Your head is kind of spinning. And so she came out, I was like 'Huh?' and then she took an interesting approach, which you'll have to watch tonight. But she didn't say her name so the whole time I'm like, 'I'm pretty sure it's you...'"

"And there definitely was a connection and chemistry there and we had sex," Sandoz recalls of her encounter with Viall. "It was just a fun night.

Sandoz said she was unsure if Viall would remember her. The two held hands and were seen hugging in the clip as Viall met her and the 29 other women who will compete for his love.

Viall received some advice from "Bachelor" alums, including Desiree Hartsock and Ali Fedotowsky live on "GMA" this morning. The 36-year-old said he also gets tips from men formerly on the dating show.

"I'm good friends with Chris Soules and Ben Higgins, and they kind of prepped me like, 'It sounds great, but it's really hard because you want to give everyone your attention,'" he said. "You want to make sure that they feel comfortable and welcome and they want to get to know you, so you're just trying to remember what you should say, or not say. So, it's hard, and they weren't kidding."

"The Bachelor" premieres at 8 p.m. ET on ABC, tonight.