Celeb Sightings: Kendall and Kylie Jenner Strike a Pose at PacSun

Kendall and Kylie Jenner celebrated their exclusive PacSun summer collection with an in-store appearance at the Third Street Promenade in Santa Monica, Calif. Credit: Dan Steinberg

--Kendall and Kylie Jenner celebrated their exclusive PacSun summer collection with an in-store appearance at the Third Street Promenade in Santa Monica, Calif.

--Taylor Swift danced on the side of the stage as boyfriend Calvin Harris spun at the Sweetlife music festival in Columbia, MD.

--Louise Roe signed copies of her new book Front Roe at the opening party for the new UNOde50 Boutique in the King of Prussia Mall.

--Carla Facciolo and rumored boyfriend Franco Porporino had dinner at his eatery Franco da Fresco in Montclair, N.J.

--Alessandra Ambrosio wore the GEORGE LOVES Spring Grey Small Stripe V Neck Tee while on the beach in Rio de Janeiro, Brazil.

--50 Cent poured EFFEN Vodka into partygoers' mouths from his upper level bungalow at Encore Beach Club at the Wynn Las Vegas.

--Carmelo Anthony celebrated his 31st birthday with wife La La Anthony at Avenue in NYC.

--Warwick co-owners JT Torregiani and Sylvain Bitton joined their friends Ross Naess, Diana Ross, and Evan Ross for a family night at Warwick's Summer 2015 Preview in L.A.

--Hilary Duff smiled for photographers after picking up some essentials from Eddie Bauer in L.A.

--Megan Fox and the cast of Teenage Mutant Ninja Turtles went out for dinner at Tao Downtown in NYC.

--Sofia Vergara got motivated to work out on her Peloton bike at her home in L.A.

--Miles Teller watched music side-stage with girlfriend Keleigh Sperry at BottleRock Napa Valley, Calif.

--Nick Young faced off against Tyga during the Celebrity Basketball Spectacular game to benefit Sports Spectacular and hosted by LA Gear at Equinox gym in L.A.

--Neil Patrick Harris surprised boyfriend David Burtka with a birthday cake on the stage of Burtka’s play It Shoulda Been You on Broadway in NYC.

--Bill and Hillary Clinton headed backstage to visit with the cast after watching a performance of American In Paris on Broadway in NYC.

--How to Be Single costars Rebel Wilson and Leslie Mann played around in the dugout before Sunday afternoon’s Mets game against the Miami Marlins in Queens, N.Y.

--Katharine McPhee refueled on sushi and wine at Blue Fin after dance rehearsals for the upcoming Smash reunion in Times Square, NYC.