PASADENA, CA - JANUARY 15: Actress Vanessa Hudgens attends the FOX winter TCA 2016 All-Star party at The Langham Huntington H
Jason LaVeris/FilmMagic

Vanessa Hudgens and her bae Austin Butler got a little nature-friendly over the weekend, but it might end up costing them a pretty penny. 

On Instagram on Sunday, Hudgens shared a since-deleted photo of a rock carved with a heart inscribed with their first names. Unfortunately they were in Arizona's Coconino National Forest, where damaging natural features is punishable by a $5,000 maximum fine and up to six months in jail. (Seriously.)

Coconino spokesman Brady Smith tells the Associated Press that authorities are investigating the incident, despite acknowledging that he is unsure if signs explain the law. "People make mistakes whether knowingly or unknowingly," Smith says.

Here's the photo, which has since been deleted from Hudgens' Instagram, although other pics of the expedition remain:

Hudgens recently played Rizzo in Fox's Grease: Live; she did the performance just one day after her father died of cancer. Her most recent film work was 2015's Freaks of Nature, a horror-comedy.