In an interview on Good Evening with Raquel Bigorra, he added [translated]: "Everyone is invited, everyone who wants to come."
Her mother said: "If you can come to sing, to honour us with your presence and your voice ... [you are] welcome."
There will be three bands, a horse race with a cash prize and even VIP tickets for the event.
The birthday girl wrote on Facebook that she thought it was "funny" the video had gone viral, but admitted to having concerns about the amount of people attending amid confusion about it possibly being cancelled.
She explained [translated]: "The 15th birthday is without doubt, for all Mexican women, an event that we crave before our wedding because it's the best thing that can happen in life.
"At first I thought it was very funny, but I think it [is] out of control ... I don't know why people thought it was all of Mexico invited."