The 31-year-old heiress will tie the knot with James Rothschild at Kensington Palace later today (10.07.15) and the 'Hello' hitmaker - whose daughter Nicole shot to fame alongside Paris Hilton in 'The Simple Life' - will be providing the entertainment at their reception.
A source told The Sun newspaper: ''Lionel has a break in his busy schedule in between performing in Henley-on-Thames and Switzerland.
''He doesn't normally do weddings but agreed as he's been pals with the Hiltons for years and was in the country anyway.
''For them it's not like booking a huge star, more like an old family friend who will get up and sing. That's not to play down how amazing it will be.''
Following Lionel's performance, Paris, 34, will perform a DJ set and is even told guests at her sister's bachelorette party that she is considering singing some songs too.
During Nicky's bachelorette party - which Paris organised - the group of girls donned bright pink sashes as they partied into the early hours of the morning.
Enjoying a bright pink cake, which was made to look like an engagement ring box, vodka and champagne, the group - which also included friend Allison Melnick and cousin Brooke Brinson Wiederhorn - later joined Paris in the DJ booth, where she played her single 'High Off My Love'.
Sharing a snap of herself dressed in a custom-made 'Hilton Bridesmaids' hoodie and cap, Paris wrote on Instagram: ''Thank you @SBGoodman for all the custom made #HiltonBridesmaids clothes, hats & sunglasses! It made #NickysBachelorette weekend even more special! #MrsRothschild (sic)''
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