Diana Ross closed the show at Saturday night's iconic Platinum Jubilee concert, which was attended by many members of the royal family.MORE: Kate Middleton and Princess Charlotte showcase their singing skills at Platinum Jubilee concertAnd following the night, the iconic singer took to Instagram to share a heartfelt message.Tagging the royal family on Instagram, Diana wrote: "What a beautiful night! I was honored to celebrate Her Majesty The Queen and to share the love with everyone. I am filled with gratitude."Thank you to @theroyalfamily for allowing me to be a part of such a special and historic moment.