Lady Gaga has never shared a birth time. Lady Gaga was born on 28 March 1986 at Lenox Hill Hospital in Manhattan, New York City, and the date by itself fixes an Aries Sun and a Scorpio Moon. The Moon stayed in Scorpio from midnight to midnight, so no missing hour can move it. Venus is in Aries as well, and Mars had only just reached Capricorn.
None of the birth times found online for Lady Gaga comes from Lady Gaga. The best known, 9:53 am, appeared in a birthday tweet. Astrotheme credits that tweet to Lady Gaga, but Astro-Databank found it came from a promotional team, and no such post from Lady Gaga's own account has turned up. Both sites rate it DD, the grade for data that conflicts or can't be checked.
The others are thinner still. 5:07 pm comes from a screenshot of an Instagram comment that nobody has verified. 10:55 pm was printed by a German astrology magazine, which was quoting a French website that named no source. A 2008 tweet mentioning "2 am" sometimes joins the list, but it was about a party, not a birth. Fans hunting for the hour are doing it out of love; the trail simply runs out before it reaches a record.
Most of this chart holds at any hour. The Aries Sun is the sign of the first spark: courage, speed and a love of going where nobody has gone yet. A trine to Saturn in Sagittarius gives that fire some backbone, the kind of discipline that turns a daring idea into years of steady work. Venus joins the Sun in Aries, so taste and affection are bold and direct, and its flowing trine to Uranus adds a gift for surprising style.
The Scorpio Moon runs deep. It shares the sign with Pluto, which suggests an emotional life that is loyal, private and fearless about intensity, and able to pour all of that into performance. Mars at the threshold of Capricorn brings stamina and a long view. Jupiter is at home in Pisces, generous and imaginative, with Mercury retrograde in Pisces nearby: a mind that thinks in images, melody and feeling before it thinks in words.
A confirmed birth time would add the rising sign and the twelve houses, the layer of a chart that shifts every few minutes. The three times in circulation show how much rides on it. 9:53 am would put the rising sign in Gemini, with the Sun and Venus in the 11th house of friends and audiences. 5:07 pm would put the rising sign in Virgo and the Sun in the 7th house of partners. 10:55 pm would put the rising sign in Sagittarius, with Mars, Saturn, Uranus and Neptune all in the 1st house. Those are three very different charts, so here they stay as possibilities until a real source appears.