"In the hood. It's MC Junior, you know it's good."
Andre, 46, captioned the clip: "Now let me explain.... I've had 3 number ones yeah........ but J wanted to freestyle so erm...... anyway I guess you need to follow him now 'cos he got me good @officialjunior_andre"
The singer has only ever had one Number One single in the UK, Flava, in September 1996.
Andre rose to fame after the release of Mysterious Girl in 1995, but it peaked at Number 2. His 1997 singleNatural reached Number 6.
British Prime Minister Tony Blair talks to singer Peter Andre during the EU enlargement: Unification of Europe - VIP Party, to celebrate the entry of 10 new countries into the European Union, at the Foreign and Commonwealth Office in London. Where Mr Blair launched the Crossroads for Ideas initiative, a joint project between the Foreign Office and the British Council. The scheme will bring some of the most talented young professionals from Central Europe - working in television, fashion, design, architecture, science, the environment and finance - to meet their British counterparts to exchange ideas, experiences and skills.
Pop stars Peter Andre (left) and Robbie Williams in London today (Thursday) before appearing at this evening's 1996 MTV Europe Music Awards. Williams, formerly of Take That, will be hosting the awards, whilst teen heart-throb Andre will be performing in the show. Photo by Michael Stephens/PA.
Former Take That star Robbie Williams (bottom left) and pop star Peter Andre (bottom centre) join members of the Irish pop band Boyzone for a photocall prior to the 1996 MTV Europe Music Awards in London. Williams will host the show * Boyzone (l-r) Stephen Gately, Ronan Keating, Shane Lynch, Keith Duffy (seated, Nike cap) and Michael Graham.
FOR EDITORIAL USE ONLY. Pop Star Peter Andre, who has recently hit the charts with his new singler All About Us, after he had his hand cast today (Tuesday) at the Rock Circus 'Wall of Hands' in conjunction with the Coca Cola Thirst For it Competition. Photo by Ben Curtis/PA
Former Take That stars Robbie Williams (right) and Gary Barlow (2nd left) line up with Peter Andre and Channel 4's Big Breakfast presenter Denise Van Outen, for the finale of tonight's (Sunday) Concert of Hope, at London's Battersea Power Station. Proceeds from the annual concert will benefit the Diana, Princess of Wales Memorial Fund. See PA story DIANA Concert. Photo by Fiona Hanson/PA
Glamour model Jordan with her parents Amy (far left) and Paul (centre left) and her boyfriend, singer Peter Andre arrive at Gordon Ramsay's temporary restaurant in Brick Lane, east London for 'Hell's Kitchen', the ITV reality cooking show with celebrities manning the kitchen . Hosted by Angus Deaton, the show sees the worst chefs voted off by the public.
Jordan and Peter Andre during the Glamour Women Of The Year Awards at Berkeley Square in central London - the first annual award ceremony held by the women's magazine.
Peter Andre and Jordan at the BRMB Party in the Park, Cannon Hill Park, Birmingham. Doug Peters/allactiondigital.com
A pregnant Jordan and boyfriend Peter Andre arriving at the European Premiere of House of Wax, Leicester Square, London.
Peter Andre and Katie Price at the The BBC Radio 1 Chart Show Live, which is being held at the Brighton Dome, Brighton.
Katie Price and Peter Andre leaving the High Court in London after winning thier libel case against the News Of The World.
Peter Andre and girlfriend Emily MacDonagh arriving at The National Television Awards 2013, The O2 Arena, Greenwich, London.
Peter Andre and Emily MacDonagh attending the Caudwell Children Butterfly Ball, held at the Grosvenor House hotel in London.
Ed Sheeran and Peter Andre at the Nordoff Robbins O2 Silver Clef Awards at the Grosvenor House, Park Lane. (Photo by Keith Mayhew / SOPA Images/Sipa USA)
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After appearing on I'm A Celebrity... Get Me Out Of Here!in 2004 he release the song he had penned in the jungle - Insania, but it flopped.
Last month Junior posted a picture on Instagram of himself in a pair of swimming trunks on the beach and joked he was trying to attain his father's infamous abs.
He captioned the image: "Loving the beach life! (tryna shape up like dad) @peterandre [sic]"
Andre famously flaunted his body in the video for Mysterious Girl.
The singer is father to Junior and 12-year-old Princess, who he had with his ex-wife Katie Price. He also has a five-year-old daughter Millie and two-year-old son Theo with second wife Emily MacDonagh, who can be seen laughing in the video.