Can U Keep A Secret was created in 1989.
Keep It a Secret was created in 1952.
Keep Me a Secret was created in 2003-03.
Can't Keep a Secret was created in 604.
Keep It Like a Secret was created on 1999-02-02.
It Is No Secret was created in 1951.
A Secret was created in 2007.
The Secret Is Out was created in 1995.
To keep a secret = Guardar un/el secretoPlease keep it a secret = Guárdame el secreto
By not telling anyone the secret, keep the secret a secret.
The Secret - book - was created in 2006-11.
Secret Rhythm of the Universe was created in 2001.
The same way you keep anything a secret - you tell no one you can't trust.