The 36-year-old Williams beat her next opponent, Julia Goerges, at the French Open with a fine serving display.
One break in each of the three sets was all that decided the fixture, as Williams mimicked Giorgi's guarded game after going a break up in the first, completing a polished performance in a little less than two hours.
She figured out Giorgi's strong serve, avoided any break points and had just four unforced errors.
The way she is striking the ball and moving in her second Grand Slam back after childbirth she would arguably be favourite for the title even with the likes of Garbine Muguruza and Simona Halep still in contention.
She now has a 39-35 record when losing the first set at a major. "I'm just pleased with my game today".
All 10 of the top women's seeds suffered shock defeats in the opening four rounds for the first time in the Open Era.
Kerber, the former world No.1 and runner-up to Williams in 2016, plays Latvia's 2017 French Open champion Jelena Ostapenko in Thursday's second semi-final after outclassing Russian 14th seed Daria Kasatkina 6-3 7-5.
Or when, about 10 minutes later, she stretched for a lunging backhand victor to break at love and take control of the third set, then raised a fist, figuring a berth in her 11th semifinal at the All England Club was close at hand.
Goerges had failed to make it past the fourth round of any major before this tournament, and her best Wimbledon finishes were third-round appearances in 2010 and 2011.
The Queen is back, with Tuesday's win guaranteeing that she will jump from 181 to at least 51 when the new rankings are announced next week.
"It sounds insane to maybe have the chance to share a German final in Wimbledon".
Goerges earned her spot in the semis with a three-set victory over Kiki Bertens 3-6, 7-5, 6-1.
Goerges had gone out in the first round at Wimbledon for the past five years.
Giorgi appeared a bit salty - maybe that's her normal demeanor - as she shook hands with Williams at the net after the match and quickly grabbed her bag and walked off the court. "Everybody has the same chances to win that match, and I'm looking forward to it". In a matchup of the only two mothers remaining in the draw, she jumped into a 3-0 lead in both sets and wrapped up the win in 62 minutes.
With Kerber also advancing, it is the first time two German women will play in the Wimbledon semifinals since 1931.
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