Kush, 31, looks after Shatrughan's film and television production business, unlike his twin brother Luv, who has tried his hand in acting.
Shatrughan, a former Union Minister, is the BJP MP from Patna.
His daughter actress Sonakshi Sinha, who was last seen in the recently released movie Tevar,
She also tweeted a picture from the wedding ceremony in which Modi is seen with the newly-wed couple.
"Thank you @narendramodi sir for keeping your promise to me! You made our day truly even more special," Sonakshi posted.
Maharashtra Governor C Vidyasagar Rao and Chief Minister Devendra Fadnavis also attended the wedding ceremony along with Shatrughan's close friends and family members.
Picture Courtesy: @sonakshisinha / Twitter