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from www.tmz.com – OctoMom’s first day as a self-serving porn star is in the can … so to speak.

TMZ has learned … Nadya Suleman completed her first day of XXX shooting at a porn mansion in the San Fernando Valley on Thursday … and we’re told things couldn’t have gone better!!!

We’re told Octo appeared nervous when she arrived to the home … but after chatting with some other porn stars who were at the house, she seemed to calm down.

Before the shoot, producers decided it would be a good idea to screen some porno flicks for Octo as an educational tool … so to speak.

But when it was time for Octo to get down to business … with herself … one source on the set tells us “She was a natural … she looked great!!”

Hopefully Octo has a good babysitter — ’cause she’s due back on the set next week.