Rihanna Anti cover
Rihanna's eighth album Anti is rumoured for release on 4 DecemberRoc Nation/Roy Nachum

Speculation continues to mount about the elusive release date of Rihanna's new album Anti, but sources now claim the LP could drop on 4 December 2015. The Diamonds singer has kept fans in the dark about the anticipated release meaning it will likely arrive without warning.

Fans are still unlocking teasers for RiRi's eighth studio album on her new website but they may not have to wait much longer with the New York Post's Page Six reporting that the record will arrive as a surprise for her fans. Anti had been expected to drop on 27 November but it was a no-show with fans instead scrambling over the pop star's world tour announcement.

In support of the album, RiRi will be heading out on the road in February 2016 kicking off with a North American leg before heading over to the UK and Europe in June where she will perform 25 shows out of a total of 61. Tickets for the mammoth stadium tour will include dates in Manchester, Dublin, Glasgow and London, went on sale on 3 December.

Rihanna Anti tour
Rihanna will kick off her Anti world tour in February 2016Kevin Winter/Getty Images for CBS Radio Inc.

Previous reports claimed the Anti album would be streamed for free on Jay Z's music streaming service Tidal for a week before being made available for wide release. RiRi was also expected to clash with ex-boyfriend Chris Brown who was initially expected to drop his new album Royalty on 27 November before pushing it back to 18 December. Anti is expected to feature the tracks Bitch Better Have My Money, FourFiveSeconds and American Oxygen as well as collaborations with Kanye West, Paul McCartney and her rumoured boyfriend Travis Scott.

Even without the album release, Rihanna has still enjoyed an incredibly successful year in music. Spotify revealed the 27-year-old to be 2015's most-streamed woman in music despite her last LP, Unapologetic, dropping in 2012.

Full list of European Anti tour dates

June 11 - Amsterdam, Holland @ Amsterdam Arena

June 14 – Coventry, United Kingdom – Ricoh Arena

June 16 – Cardiff, United Kingdom – Cardiff Stadium

June 18 – Sunderland, United Kingdom – Stadium Of Light

June 21 – Dublin, Ireland – Aviva Stadium

June 24 – London, United Kingdom – Wembley Stadium

June 27 – Glasgow, United Kingdom – Hampden Park

June 29 – Manchester, United Kingdom – Emirates Old Park

July 4 – Stockholm, Sweden – Tele2 Arena

July 7 – Copenhagen, Denmark – Refshale Island

July 9 – Hamburg, Germany – Volkspark Stadion

July 13 – Milan, Italy – San Siro

July 15 – Nice, France – Allianz Stadium

July 17 – Frankfurt, Germany – Commerzbank Arena

July 19 – Lyon, France – Grande Stade

July 23 – Lille, France – Stade Lille

July 26 – Prague, Czech Republic – Synotip Arena

July 28 – Cologne, Germany – Rhein Energie Stadion

July 30 – Paris, France – Stade de France

August 2 – Berlin, Germany – Olympiastadion

August 5 – Warsaw, Poland – PGE Narodowy

August 7 – Munich, Germany – Olympiastadion

August 10 – Vienna, Austria – Ernst Happel Stadium

August 12 – Zurich, Switzerland – Letzigrund Stadion