"Don't challenge a Dancing With the Stars pro to a dance off" is one of those life lessons we thought everyone knew, like "never get involved in a land war in Asia" and "your favorite show will make you cry during November sweeps." But apparently cute Bachelorette winner Jef Holm missed the message.

On Tuesday, October 2, Jef attended the launch of the new videogame Just Dance 4 along with a ton of DWTS stars, including fan-fave pro dancer Karina Smirnoff. And according to People Jef had the guts to challenge Karina — as well as Pretty Little Liars star Ashley Benson (Hanna) — to a dancing show-down.

People doesn't report on who boogied the best, but as much as we love Jef, we're going to go ahead and assume Karina probably came out a tad ahead. Jef's natural skillz can only amount to so much in the face of years of training.

Catch a new episode of Dancing With the Stars Season 15: All-Stars on Monday, October 8 at 8 p.m. ET/PT on ABC.

Source: People

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