This is not surprising whatsoever. To be honest I expected him to be physically acting as opposed to doing voice over work. What do you think he has been perfecting the Zoolander pout for? But these animated joints tend to make hella money, and champagne drenched private flights are expensive. According to Rueters via ATF:
Singer/Actress Jennifer Lopez is the latest voice addition to the forthcoming animated film “Ice Age: Continental Drift.” Lopez and actor Jeremy Renner will join new voice cast members Keke Palmer, rapper Drake, Wanda Sykes and Aziz Ansari. The new additions was announced on Tuesday (April 26) during a Fox presentation, during which the studio met potential promotional partners, licensees and retail partners.