The music icon wowed the crowd with a show stopping performance on Lytham Green, where the festival is being held in its biggest format yet.
Singer Jack Savoretti took to the stage earlier in the evening as fans got into the festival spirit.
Take a look at our special picture gallery of the opening night.
The Festival is running for a total of 10 nights – until Sunday, July 10 – with Lewis Capaldi headlining tonight.
For the full line-up, click here
1. Lytham Festival 2022: Day One with Diana Ross
Festival revellers get a good spot to see Diana Ross perform at Lytham Festival Photo: Daniel Martino
2. Lytham Festival 2022: Day One with Diana Ross
Diana Ross performs at Lytham Festival Photo: .
3. Lytham Festival 2022: Day One with Diana Ross
The crowd was in high spirits despite the showers Photo: Daniel Martino
4. Lytham Festival 2022: Day One with Diana Ross
Festival-goers were delighted to see the event return after three years on Tuesday, June 28 Photo: Daniel Martino
5. Lytham Festival 2022: Day One with Diana Ross
The event, which attracts hundreds of thousands of music fans, is being held on Lytham Green over 10 nights Photo: Daniel Martino
6. Lytham Festival 2022: Day One with Diana Ross
Ready to party Photo: Daniel Martino