The star-studded event took place in West Hollywood on Saturday
The stars gathered at the annual event at the Pacific Design Center in West Hollywood on Saturday evening with a shared goal of raising money for children living in poverty. Guests sipped on Casamigos cocktails throughout the night.
Kardashian, 43, who received the Giving Tree award at the gala last year, wore a black turtleneck lace gown with a beige Pantabodysuit underneath by Balenciaga.
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Bieber, 26, opted for a sleek look for the occasion, wearing a strapless black gown with an open back, which she paired with gold embellished earrings.
Alba, 42, meanwhile, stood out as she wore a strapless gold chrome dress with matching platform heels.
This year’s recipient of the Giving Tree award was Hayek Pinault, 57, who attended with her husband, François-Henri Pinault.
The actress dazzled in a dark green sequinned halterneck gown as she gave a speech onstage after being introduced by her Magic Mike: The Last Dance costar, Channing Tatum.
“I cannot tell you how thrilled I am that you guys included me in this so very special night. I am such a big fan of this organization. I have a lot of respect for it,” began Hayek Pinault.
The actress went on to thank Baby2Baby co-CEOs Kelly Sawyer Patricof and Norah Weinstein in her speech, calling them "impressive and inspiring" following their work with the nonprofit.
“We have a responsibility. They call in their hearts our future. They are our hope. And when we talk about essentials, I want to say something to you. Those of you that bought a pack of diapers or any of the essentials. Dignity are essential. Diapers are dignity. Make no mistake, love is an essential," Hayek Pinault said.
"... It's not just money, it is love. It is compassion. It is caring. We are all interconnected, Baby2 Baby. Thank you very much,” she concluded.
Among the other stars who attended the Baby2Baby gala were Gwyneth Paltrow, Vanessa Bryant, Demi Lovato, Katharine McPhee, Kirsten Dunst, Jesse Plemmons, Jenna Dewan, Nikki Reed, Michelle Monaghan, Heidi Klum, Alessandra Ambrosio, Camila Alves McConaughey, Chrissy Teigen, Sarah Hyland and Zooey Deschanel.
Paltrow, 51, for her part, carried out catering duties at the event, manning the Broad Street Oyster Co. & Goop Kitchen station.
She was seen in a video shared on her Instagram Story adding chili oil to a tray of oysters after swapping her glam arrival look for a uniform and apron.
During the donations part of the evening, Miranda Kerr, 40, and her husband, Snapchat CEO Spiegel, 33, donated $1 million remotely, while Kardashian and Emma and Jens Grede from SKIMS donated $500,000. Alba and her husband, Cash Warren, meanwhile, donated $25,000 as did Paul, 41.
Snoop Dogg also performed as a musical guest during the event.
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