Remember when Taylor Swift was spotted out with the Foster the People frontman Mark Foster? The world figured the duo were out on a date, but it turns out it was actually a business lunch. Maybe Foster was worried if he dated T-Swizzle that she'd write a whiny song about him later (eh, John Mayer?). In any case, they came up with a song together over the meal!Fuse chatted up Foster at Bonnaroo, where he dished on a potential duet with the country cutie.

"We actually wrote a song that day," Foster said. "It's a really cool song. We kind of just went into it casually, like, 'Yeah, let's just jam, let's just have fun,'" he added, "and something really cool came out of it."

So where and when can we hear the track? Foster's not too sure just yet. "We'll see what happens with it," he told Fuse. "She's been writing a lot for her next record, but yeah -- it was a lot of fun working with her. She's super talented."

Indeed she is -- she even taught her pal Zac Efron how to play Foster's hit 'Pumped Up Kicks' back in February when she appeared on ‘Ellen.’

While Swift is hard at work writing for her new record, Foster and Co. are busy prepping their own release as well.

"We’ve just been kind of throwing everything against the wall, idea-wise, like, ‘We should try this and we should try this,’ all these different boundaries to work within, because sometimes it can be really daunting I think, if you don’t have certain boundaries when writing a song," Foster said in December. “There’s definitely musical elements that we’ve talked about,” he continued. “You know, really leaning on the percussive nature of what our live show has turned into this year, and bringing that more out into the second record — just kind of experimenting, doing some different, weird studio tricks; just having fun with it. But you never really know until you get under the hood, so we’ll see what happens when we start.”

Watch Mark Foster Talk About Taylor Swift