Apparently there was a compromise on Yahoo's end and it sent out a spam email to all of my contacts.

I just got off with support:

Lovely: Some users have reported that their contacts received spam that originated from their Yahoo! Mail account.

Lovely: Since you are experiencing this issue, we strongly believe your account has been compromised and was used by an unauthorized third party to send spam or fraudulent emails to your contact list.

I've changed passwords and hope that this has been taken care of but please notify me immediately if you recieve spam from my account.