On August 31st, Mahesh Babu's son Gautham celebrates his birthday. No doubt our Superstar is double delighted this year both for Srimanthudu's success and his son's birthday coming up during a break time. For that reason he has special plans.To celebrate his son's birthday, the whole of family of Mahesh including Namrata and kids have left for Koi Samui island in Thailand to kick start the celebrations. Both Mahesh and Gautham will be indulging in lot of water sports as the love to hang on at the beaches. For a week long, these celebrations will go on before Mahesh heads to India for Brahmotsavam shoot.On the other hand, Srimanthudu is continuing its upper hand box office with 'share' collection likely to touch 80 crores this weekend.