Answer:
I am really excited about your party.
Step-by-step explanation:
Let's put these answers into the gap to see which one makes sense:
I am really excited to your party. - NOPE
I am really exciting to your party - NOPE
I am really exciting about your party - NOPE
I am really excited about your party - YES
I hope my answer helped you! If you need more information or help, comment down below and I will be sure to respond if I am online. Have a wonderful rest of your day!