Britney Spears Pumped Her Pepsi Money into Coke

Talk about a slap in the face -- after earning $8 MILLION from her infamous Pepsi deal back in 2001, Britney Spears went turncoat by investing in Coca-Cola!

We've obtained new docs in Britney's conservatorship case, which detail her investment portfolio, including her overall gains and losses for the year 2012 -- the most intriguing part is what she dumped into Pepsi's arch enemy.

Britney sold 574 shares of Coke for a modest profit of $3,238.55. She held on to 208 shares. As for Pepsi ... it's nowhere to be found in her portfolio.

Brit sold a few other random stocks for a profit -- including AT&T and Deere & Co. -- but it wasn't all gravy: she lost $640.13 on McDonald's and $1,277.38 on Chipotle. She eats at both places enough that you'd think the stock would be worth more.

Overall, Brit netted $97,883 last year in stock earnings ... not bad, but for her it's chump change (she'll earn more than triple that PER SHOW in Vegas).

As for blowing off Pepsi, we don't dispense investment advice -- BUT PepsiCo has shown pretty consistent growth since the 80s ... so we gotta ask ...