Aa’isha (radiyallaahu-anhaa) said: The Prophet (sallal-laahu-alayhi-wasallam) used to say:

اللَّهُمَّ كَمَا حَسَّنْتَ خَلْقِي فَحَسِّنْ خُلُقِي

”O Allaah! Just as you have made my physical appearance good (or perfect without defects);then make my manners good.”

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[Reported by Imaam Ahmad (rahimahullaah). Number: 23871]

Imaam Imaam Albaani (rahimahullaah) said this hadeeth is authentic

without the addition [ وحَرِّمْ وَجهي عَلى النار ]

[See Irwaa al-Ghaleel. Vol 1. Page: 113. Hadeeth Number: 74]