Steve Aoki gave Katie Couric a DJ lesson for Yahoo Music's Backstage With Citi series. Credit: Gordon Donovan

--EDM DJ Steve Aoki gave Katie Couric a DJ lesson while being filmed for Yahoo Music’s Backstage With Citi series.

--Empire’s Jussie Smollett and New Girl’s Max Greenfield shared some laughs at UCLA's Jonsson Cancer Center's 20th annual Taste for a Cure in Beverly Hills.

--Patrick Schwarzenegger relaxed with friends on the patio at the Toca Madera restaurant opening party in L.A.

--LeAnn Rimes and Eddie Cibrian with a group of 20 friends celebrated Cinco de Mayo with Casamigos margaritas at Cafe Habana in Malibu, Calif.

--Whiplash star Austin Stowell picked up Sonya Dakar skincare products at the Wish Upon A Team event at Sonya Dakar Skin Clinic in Beverly Hills.

--Mark Duplass attended the opening night of Street Food Cinema for the 30th anniversary screening of The Breakfast Club at Exposition Park in L.A.

--Bride-to-be Whitney Port tested out wedding looks with celebrity hair stylist Mark Hill in celebration of Mark Hill Salon Professional’s introduction to ULTA Beauty in NYC.

--Azealia Banks cured her hangover with an IV drip from The Hangover Club at her apartment in NYC. 

--UFC legend Georges St-Pierre and New York Mets Hall of Famer John Franco had sliders and tequila at The Lure Group’s Slate in NYC.

--Presenters Natalie Morales and Jorge Bernal chatted at the Latin Billboard Music Awards rehearsal's Samsung Lounge in Miami, FL.

--Solange Knowles sipped Bombay Sapphire cocktails at the Pioneer Works Second Annual Spring Fete dinner and art auction event in Brooklyn.

--Victoria Justice joined world champion surfer Kelly Slater to celebrate the launch of the Kelly Slater for PBteen collaboration in Santa Monica, Calif.

--Scooter Braun was drinking a Zodiac Vodka cocktail at the exclusive brand launch party in L.A.

--Jaime King got glam for the Met Gala using Matrix Style Link Texture Builder at the Greenwich Hotel in NYC.

--Andi Dorfman and Sarah Hyland ordered a bottle of Pinot Grigio at Black Rock's Fillies & Stallions party in Louisville, KY.

--Jason Derulo enjoyed a cajun ribeye at Chicago Cut Steakhouse in Chicago.

--Miss Germany-turned-model Alyssandra Snows met up with the world's leading stem cell expert, Dr. Brian Mehling, to discuss a new business venture with Dr. Mehling's company Bluehorizonskincare.com in anticipation on Alyssandra’s upcoming stem cell infused skin care line at the Plaza Hotel in NYC.

--Supermodel Alessandra Ambrosio ran errands with her son wearing Made Eyewear’s Bronson sunglasses in silver with silver mirror lens in Santa Monica, Calif.

--Swizz Beatz celebrated the launch of DEATH BY DOLLS Fall/Winter ’15 collection with a small presentation and party where guests enjoyed cocktails by William Wolf Whiskey and danced to music by DJ Cory Kennedy at hot spot Electric Room at Dream Downtown in NYC.

--Meghan McCain read a copy of Jordan Reid’s Ramshackle Glam.

--Tanna Frederick - currently starring in Train to Zakopane in L.A. - hosted TMI at Second City in Hollywood.

--Indie rock band Waters held a meet and greet for fans at Sam Ash in Hollywood.

--Dave Grohl presented the ASCAP Founders Award to Gene Simmons and Paul Stanley on behalf of Kiss at the 32nd Annual ASCAP Pop Music Awards at the Loews hotel in Hollywood.

--RHOC's Vicki Gunvalson and Lauri Peterson wore designs by Marisa Kenson from Vicki’s online store to enjoy a day of pampering on board a luxury yacht for The Orange County Sirens businesswomen event in Newport Harbor, Calif.

--Extra’s Charissa Thompson had a consult with owner Mary Brambila and shopped for hair products at Brambila Salon in Santa Monica, Calif.

--Parker Posey sang along with the crowd to Journey's “Don't Stop Believin’” played by Joe McGinty during a huge opening party for Sid's Gold Request Room in NYC.

--Tyson Beckford took over the DJ booth during a late-night party where Rita Ora also performed at 1Oak in NYC.

--David Beckham got a special 40-year-old scotch in a one of a kind crystal decanter during a surprise birthday celebration at his Haig Club offices in London.

--Jay Z signed two bottles of Armand de Brignac Ace of Spades for a neighboring table during his D'USSE party to celebrate the Pacquiao vs. Mayweather fight at Marquee in Las Vegas.