The 34-year-old star said she never had and will never have affair with Jay Z, 44, who is married to Beyonce Knowles, 32, and has a daughter Blue Ivy Carter with her, reported E! Online.
"Never did, never was, never will. Illegitimate, thirsty sources with no facts and that's the 'media' for you -especially today.
"I play second to no one, pay my own bills, have my own label, own management company, rely on God only and respect myself & marriage too much for nonsense," she wrote on Instagram, when a user asked her whether she was Jay Z's mistress.
"False rumors are crafted for ratings & numbers. And miserable, unhappy people need someone to judge to deter the attention away from their own misery and feel better about their miserable lives. If they did it to Jesus, they'll do it to anyone. God bless," she added.
The Mya-Jay cheating rumors originated from a blind item posted online claiming the 44-year-old rapper had a longtime relationship with a "very short named R&B singer who hasn't had a hit in awhile and doesn't really even act or record any longer".
Beyonce added fuel to the rumors this week during a concert when she changed the lyrics of 'Resentment', her 2006 song about infidelity, to reflect the number of years she and Jay have been together.
