Art-world power couple Sheree Hovsepian and Rashid Johnson — who just had a major solo exhibition at the Guggenheim — have split, Page Six has learned. A source tells us that the glamorous twosome have separated, though we hear they have not officially filed for divorce. They confirmed the breakup to Page Six in a joint statement, saying: “After 15 years of marriage, we’ve made the difficult decision to separate. We do so with love, care and deep respect for one another, recognizing that we will continue as friends and will always be a meaningful part of each others’ lives.” Artists Rashid Johnson and Sheree Hovsepian, shown here on the carpet of the 2025 Met Gala, have separated Page Six has confirmed. Getty Images They continued: “We’re optimistic about this new phase, and about the support we will offer each other as we continue to co-parent our incredible son. We ask for your grace and understanding as our family navigates this transition.” The pair share a 14-year-old son.…