You are the most beautiful and the most xcellent in my heart.
= You are the most beautiful as well as the most excellent in my heart.
最：用最高级,beautiful- most beautiful
excellent- most excellent
在我心中：in my heart
You are the most beautiful and the most xcellent in my heart.
= You are the most beautiful as well as the most excellent in my heart.
最：用最高级,beautiful- most beautiful
excellent- most excellent
在我心中：in my heart