The X Factor judge triumphantly declared she was back on the social media website last night, tweeting: "Yippeeee back in and on!!! How's everyone's Xmas so far??"
It was her first Twitter post since 11 December - and her first post since speculation arose that her marriage to Stephen was on the rocks.
Mel's relationship has been subject to intense scrutiny since 13 December, when she pulled out of the X Factor live finale's first night.
Despite a statement being issued that she was unwell, rumours began to circulate that her absence may have been as a result of problems with Stephen.
At one stage, the rumours became so intense that Stephen was forced to issue a statement of his own denying "disgusting and untrue" claims he had hit Mel.
Mel's daughter Phoenix also spoke out to brand the accusations false.
Then, over the weekend, former Spice Girl Mel spoke out herself, repeating what Stephen and Phoenix had already been stressing to the public.
In a statement on Instagram, she said: "I'm very good was very polly [sic] but much better now and for the record my hubby never would lay a hand on me sorry took so long but any response fuels rumours #lovemyfamily #lovemyfans."
Mel and Stephen married in 2007.
They are parents to daughter Madison, three. Mel is also mum to daughters Phoenix and Angel from previous relationships.
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