TDP supremo and Chief Minister N Chandrababu Naidu formally welcomed the Kurnool MP and her followers into the party at his camp residence here this morning.
Renuka is the second YSRC MP to switch sides to the TDP after S P Y Reddy of Nandyal, also in Kurnool district.
The YSRC had petitioned the Lok Sabha speaker against Reddy and sought his disqualification under the Anti-Defection Law but the plea has been pending for over three years.
The party had eight MPs in the Lok Sabha from Andhra Pradesh after the 2014 elections but the number has now fallen to six.
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Renuka, a businesswoman and relatively new to politics, tried to join the TDP soon after her election in May 2014, following in the footsteps of her colleague Reddy.
But the YSRC leadership prevailed upon the Lok Sabha member and convinced her not to leave the Jaganmohan Reddy-led outfit.
She, however, continued to maintain a close relationship with TDP leaders over the years.
The chief minister appreciated her for joining hands with him in the development process.
TDP sources said Renuka would organise a public meeting in Kurnool soon.