"I'm sorry, You are so very beautiful."
Let's break it down:
* Lo siento: This means "I'm sorry".
* Eres: This means "you are".
* tan: This means "so".
* muy: This means "very".
* bonita: This means "beautiful" (referring to a female).
The sentence is a bit awkward in English, as it's common to express "sorry" when you've done something wrong, not just as a way to compliment someone.
Here are some more natural English translations of the sentiment:
* "You're so beautiful, I'm sorry" (sounds a bit dramatic)
* "You're so beautiful, I'm speechless"
* "You're so beautiful" (the simplest, most direct translation)
It's important to consider the context of the situation when choosing the most appropriate English translation.