MTV's "The Hills" star Lo Bosworth throws her sister, Erin Bosworth, a bacherlorette party at Tao Beach.

Lo Bosworth partied poolside at Tao Beach at the Venetian on Saturday to celebrate her sister Erin Bosworth’s bachelorette party.

Lo, Erin and friends took over a cabana where they snacked on appetizers and sipped on mojitos. The bridal party overlooked the pool scene as they toasted to Erin’s engagement with Hpnotiq Harmonie celebration shots.

Lo was found blowing bubbles and taking in the sounds before she put the finishing touches to her sister’s celebration by crowning her with a Tao tiara. The bride-to-be was surprised with a violet cake adorned with the saying, “Last Fling Before the Ring.”

The bachelorette party continued Saturday night as the Bosworth ladies and friends dined at Tao Asian Bistro before heading up to the nightclub.

Solange Knowles also dined at Tao with friends and then made her way to Marquee at the Cosmopolitan where she manned the tables in The Library.

Chris Bosh of the Miami Heat feasted on signature dishes at the hot spot, dining at a table with friends under Tao’s famed Buddha. After dinner they took over a VIP table in the moat section of the club.

Marcus Trufant of the Seattle Seahawks was spotted taking in the scene in the nightclub. Nicole Scherzinger wrapped up her birthday celebration with dinner and dancing at Tao.

At Lavo, Michael Del Zotto of the New York Rangers celebrated his 21st birthday with a group of friends that included MMA fighter Sam Stout.

Click on the photos below to enlarge.

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