Robbie Williams and Ayda Field use swearwords as nicknames for each other, with her calling him ''****'', while he refers to her as ''t**t.''
The 'Angels' singer was spotted wearing a necklace spelling **** when he performed at the Capital FM Summertime ball in London on Sunday (09.06.13), which he claims is his wife's new pet name for him.
He told The Sun newspaper: ''Ayda bought is especially for me as her nickname for me is ****. Mine for her is t**t.''
The rude monikers are a dramatic change for the couple as a year before they wed in 2010, Robbie said he called her ''boozey-woozey-woo-wooze'' while she called him ''tickles-a-no-no''.
The 39-year-old singer - who has eight month old daughter Theodora 'Teddy' Rose with Ayda - is set to kick off his Take The Crown Stadium Tour in Dublin, Ireland, on Friday (14.06.13), and has promised that will also include plenty of X-rated antics.
He has previously quipped: ''I plan to do a lot of live sex on stage and I am practicing by having a lot of un-live sex, but it didn't work out very well.
''There is lots of me singing my songs and live sex. I can promise you nudity and the sex will be with myself.''