How do you say 'You both are looking beautiful' in Spanish?

If they are male or one male and one female (informal): Los dos de vosotros os parecéis bonitos.

If they are male or one male and one female (formal): Los dos de Ustedes se parecen bonitos.

If they are both female (informal): Los dos de vosotras os parecéis bonitas.

If they are both female (formal): Los dos de Ustedes se parecen bonitas.