The duo paired up for the 3rd annual TeamUp for Kids & K9's to blend their passions: animals and children.
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McCullers and Altuve snapped pictures with fans, who also showed up to support the foundation.
Tickets ranged from $500 - $50,000 in the days leading up to the event.
The funds raised will benefit various charitable causes, including animal rescue efforts and children's charities throughout the Greater Houston community.