Summer Style: Katie Holmes, Jennifer Lopez, and Elton John's Latest Appearances

Hollywood stars have been making headlines with their summer engagements and public appearances. Katie Holmes, accompanied by her new artist boyfriend Jason Bard Yarmosky, turned heads at a Michael Kors party celebrating the brand's 45th anniversary. She sported a violet satin dress paired with red shoes, a look praised by fashion critics.

Jennifer Lopez was seen in West Hollywood after lunching with her manager, Benny Medina, and daughter Emme. Her 2011 hit "On the Floor" recently surpassed one billion streams on Spotify, marking a significant professional milestone. Meanwhile, Ariana Grande and Ricky Alvarez were photographed together in London, rekindling their past relationship after Grande's recent breakup.

Elton John was spotted enjoying his summer vacation on a yacht near Cannes, sharing a moment of amusement with a friend over his watch. Rod Stewart and his wife, Penny Lancaster, were seen out near their home, with the musician reportedly in good spirits as he recovers from heart surgery. The couple is also anticipating the arrival of their seventh grandchild.

In Los Angeles, Knox Jolie, son of Angelina Jolie and Brad Pitt, was seen leaving a Muay Thai class. The 18-year-old recently graduated high school and competed in a tournament shortly after. His twin sister, Vivienne, is pursuing a legal name change to officially drop the Pitt surname, opting for Vivienne Marcheline Jolie.