The X Factor judge and the Newcastle United premiership footballer have been the subject of tabloid gossip after Stephanie Ward, the mother of Danny's daughter Skye-Lorena, gave a series of interviews to The Sun.
Tulisa tweeted: "Wow there has been a lot of BULLS*** in the press this week! Only part of it that's true is I am very happy wid my man @dannysimpson #HAPPY."
Danny, 25, also tweeted: "@officialtulisa let them say what they want #AintGonnaMakeaDifference."
The 24-year-old singer has been on the defensive this week after she hit back at rival X Factor judge Louis Walsh on live TV when he called her a Wag, which stands for footballer's "Wives And Girlfriends".
Tulisa retorted: "Excuse me? You mean I'm a Waf! It means 'Was Already Famous'!"
The former N-Dubz star didn't let her troubles get to her as she performed at London's G-A-Y nightclub, wearing tiny gold hotpants with a matching jacket.