Camila Cabello's Solo Debut Leaks, Fifth Harmony NHL All-Star Appearance Canceled at Last Minute

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While Camila Cabello is surely riding high from positive reviews to the first single of her solo career, "Love Incredible," which leaked on Friday -- it sounds like her former bandmates might not be having such a good time.

Fifth Harmony canceled a scheduled appearance to sing the national anthem at the 2017 NHL All-Star Game on Sunday, a source inside the NHL tells ET, just "minutes before" they were scheduled to go on, due to illness -- although it was not immediately clear which member was ill. ET has reached out to Fifth Harmony reps for comment. 

WATCH: Fifth Harmony Delivers First Performance Without Camila Cabello, Wins Favorite Group at People's Choice Awards

This is the second high profile cancellation in two days for the NHL, which saw Robin Thicke drop out of an appearance on Friday, at the NHL100 Gala, where he was to honor his late father, Alan Thicke.

Singer Courtney Daniels, who is part of the L.A. Kings ice crew, stepped in to save the day at the All-Star Game, earning rave reviews from attendees like Pia Toscano as well as the Staples Center.

"Way to come in clutch singing the Anthem @courtlove_d!!!" Toscano tweeted. "You killed it! So proud of you #NHLAllStar."

NEWS: Camila Cabello on Solo Career: 'I Did Not Intend to Leave Fifth Harmony This Way'

Despite being one member down, Fifth Harmony turned it up in their first performance without Cabello at the People's Choice awards earlier this month. Check out more in the video below.