The pics were a collab with bra company MINDD, and Katharine shared that 10% of sales would be donated directly to ocean conservation non-profit (almost) Earth Day! 🌍,' she captioned the pics. In the pics, Katharine showed off some seriously sculpted abs while posing in a black bra and undies, which she wore underneath a white T-shirt and men's briefs (which, by the way, were totally see-through when wet!). The new mom, 37, who gave birth to her first son Rennie in February 2021 with musician David Foster, shared some steamy, Earth Day-inspired underwear pics with her followers.

Katharine McPhee Foster is looking so glowy, confident, and strong in her latest Instagram post. 2021, the actress has focused on balancing her mental and physical health. Since getting pregnant with son, Rennie, born Feb.The 37-year-old American Idol alum posed for an ocean-themed photoshoot in honor of Earth Day in nothing but some undies and a soaked, cropped T-shirt.