The model, 28, was active on social media all day on Sunday's holiday but did not post a tribute dedicated to her husband after they welcomed their first child together last year.
Fans have been harboring mounting concerns for Justin's health in recent months, and rumors are flying of possible marital strife between him and Hailey.
Hailey Bieber has sold her cosmetics brand for a staggering $1 billion. While husband Justin congratulated her, the sale has done little to quell rumours that not all is well in the Bieber household.